diff --git a/system/languages/ar.yaml b/system/languages/ar.yaml
new file mode 100644
index 000000000..57a6e3707
--- /dev/null
+++ b/system/languages/ar.yaml
@@ -0,0 +1,75 @@
+---
+FRONTMATTER_ERROR_PAGE: |
+  ---
+  العنوان: %1$s
+  ---
+  # خطأ: مادة أمامية غير صحيحة
+  
+  مسار: '%2$s'
+  
+  **%3$s**
+  
+  , , ,
+  
+  %4$s
+  , , ,
+NICETIME:
+  NO_DATE_PROVIDED: لم يتم تقديم التاريخ
+  BAD_DATE: تاريخ خاطئ
+  AGO: من قبل
+  FROM_NOW: من الآن
+  SECOND: ثانية
+  MINUTE: دقيقة
+  HOUR: ساعة
+  DAY: يوم
+  WEEK: أسبوع
+  MONTH: شهر
+  YEAR: سنة
+  DECADE: عقد
+  SEC: ثانية
+  MIN: دقيقة
+  HR: ساعة
+  WK: أسبوع
+  MO: شهر
+  YR: سنة
+  DEC: عقد
+  SECOND_PLURAL: ثواني
+  MINUTE_PLURAL: ‮دقائق
+  HOUR_PLURAL: ساعات
+  DAY_PLURAL: أيام
+  WEEK_PLURAL: أسابيع
+  MONTH_PLURAL: أشهر
+  YEAR_PLURAL: سنوات
+  DECADE_PLURAL: عقود
+  SEC_PLURAL: ثواني
+  MIN_PLURAL: دقائق
+  HR_PLURAL: ساعات
+  WK_PLURAL: أسابيع
+  MO_PLURAL: أشهر
+  YR_PLURAL: سنوات
+  DEC_PLURAL: عقود
+FORM:
+  VALIDATION_FAIL: '<b>فشل التحقق من صحة:</b>'
+  INVALID_INPUT: إدخال غير صحيح في
+  MISSING_REQUIRED_FIELD: 'حقل مطلوب مفقود:'
+MONTHS_OF_THE_YEAR:
+  - كانون الثاني
+  - شباط
+  - آذار/ مارس
+  - نيسان
+  - أيار
+  - حزيران
+  - تموز
+  - آب
+  - أيلول
+  - تشرين الأول
+  - تشرين الثاني
+  - كانون الأول
+DAYS_OF_THE_WEEK:
+  - الاثنين
+  - الثلاثاء
+  - الأربعاء
+  - الخميس
+  - الجمعة
+  - السبت
+  - الأحد
diff --git a/system/languages/ca.yaml b/system/languages/ca.yaml
new file mode 100644
index 000000000..b9906e6b8
--- /dev/null
+++ b/system/languages/ca.yaml
@@ -0,0 +1,75 @@
+---
+FRONTMATTER_ERROR_PAGE: |
+  ---
+  title: %1$s
+  ---
+  
+  # S'ha produït un error: Frontmatter invàlid
+  
+  Ruta: `%2$s`
+  
+  **%3$s**
+  
+  ```
+  %4$s
+  ```
+NICETIME:
+  NO_DATE_PROVIDED: "No s'ha proporcionat data"
+  BAD_DATE: Data invàlida
+  AGO: abans
+  FROM_NOW: "des d'ara"
+  SECOND: segon
+  MINUTE: minut
+  HOUR: hora
+  DAY: dia
+  WEEK: setmana
+  MONTH: mes
+  YEAR: any
+  DECADE: dècada
+  SEC: s
+  MIN: min
+  HR: h
+  WK: setm.
+  MO: m.
+  YR: a.
+  DEC: dèc.
+  SECOND_PLURAL: segons
+  MINUTE_PLURAL: minuts
+  HOUR_PLURAL: hores
+  DAY_PLURAL: dies
+  WEEK_PLURAL: setmanes
+  MONTH_PLURAL: mesos
+  YEAR_PLURAL: anys
+  DECADE_PLURAL: dècades
+  SEC_PLURAL: s
+  MIN_PLURAL: min
+  HR_PLURAL: h
+  WK_PLURAL: setm.
+  MO_PLURAL: mesos
+  YR_PLURAL: anys
+  DEC_PLURAL: dèc.
+FORM:
+  VALIDATION_FAIL: '<b>Ha fallat la validació:</b>'
+  INVALID_INPUT: Entrada no vàlida a
+  MISSING_REQUIRED_FIELD: 'Falta camp obligatori:'
+MONTHS_OF_THE_YEAR:
+  - Gener
+  - Febrer
+  - Març
+  - Abril
+  - Maig
+  - Juny
+  - Juliol
+  - Agost
+  - Setembre
+  - Octubre
+  - Novembre
+  - Desembre
+DAYS_OF_THE_WEEK:
+  - Dilluns
+  - Dimarts
+  - Dimecres
+  - Dijous
+  - Divendres
+  - Dissabte
+  - Diumenge
diff --git a/system/languages/cs.yaml b/system/languages/cs.yaml
index a97eb4cab..68a49ebbb 100644
--- a/system/languages/cs.yaml
+++ b/system/languages/cs.yaml
@@ -1,3 +1,4 @@
+---
 INFLECTOR_UNCOUNTABLE:
   - vybavení
   - informace
@@ -55,6 +56,7 @@ NICETIME:
   DEC_PLURAL: dek
 FORM:
   VALIDATION_FAIL: '<b>Ověření se nezdařilo:</b>'
+  INVALID_INPUT: Neplatný vstup v
   MISSING_REQUIRED_FIELD: 'Chybí požadované pole:'
 MONTHS_OF_THE_YEAR:
   - ledna
diff --git a/system/languages/da.yaml b/system/languages/da.yaml
new file mode 100644
index 000000000..47f5a451d
--- /dev/null
+++ b/system/languages/da.yaml
@@ -0,0 +1,75 @@
+---
+FRONTMATTER_ERROR_PAGE: |
+  ---
+  Titel: %1$s
+  ---
+  
+  # Fejl: Ugyldigt frontmatter
+  
+  Sti: `%2$s`
+  
+  **%3$s**
+  
+  ```
+  %4$s
+  ```
+NICETIME:
+  NO_DATE_PROVIDED: Ingen dato angivet
+  BAD_DATE: Ugyldig dato
+  AGO: siden
+  FROM_NOW: fra nu
+  SECOND: sekund
+  MINUTE: minut
+  HOUR: time
+  DAY: dag
+  WEEK: uge
+  MONTH: måned
+  YEAR: år
+  DECADE: årti
+  SEC: sek
+  MIN: min
+  HR: t
+  WK: u
+  MO: md
+  YR: år
+  DEC: årti
+  SECOND_PLURAL: sekunder
+  MINUTE_PLURAL: minutter
+  HOUR_PLURAL: timer
+  DAY_PLURAL: dage
+  WEEK_PLURAL: uger
+  MONTH_PLURAL: måneder
+  YEAR_PLURAL: år
+  DECADE_PLURAL: årtier
+  SEC_PLURAL: sek
+  MIN_PLURAL: min
+  HR_PLURAL: timer
+  WK_PLURAL: uger
+  MO_PLURAL: mdr
+  YR_PLURAL: år
+  DEC_PLURAL: årtier
+FORM:
+  VALIDATION_FAIL: '<b>Validering mislykkedes:</b>'
+  INVALID_INPUT: Ugyldigt input i
+  MISSING_REQUIRED_FIELD: 'Mangler obligatorisk felt:'
+MONTHS_OF_THE_YEAR:
+  - Januar
+  - Februar
+  - Marts
+  - April
+  - Maj
+  - Juni
+  - Juli
+  - August
+  - September
+  - Oktober
+  - November
+  - December
+DAYS_OF_THE_WEEK:
+  - Mandag
+  - Tirsdag
+  - Onsdag
+  - Torsdag
+  - Fredag
+  - Lørdag
+  - Søndag
diff --git a/system/languages/de.yaml b/system/languages/de.yaml
index 8fcf2e620..9dff4cb3b 100644
--- a/system/languages/de.yaml
+++ b/system/languages/de.yaml
@@ -1,13 +1,14 @@
+---
 FRONTMATTER_ERROR_PAGE: |
   ---
   title: %1$s
   ---
   # Fehler: Frontmatter enthält Fehler
-
+  
   Pfad: `%2$s`
-
-  **%3$s **
-
+  
+  **%3$s ** 
+  
   ```
   %4$s
   ```
@@ -21,8 +22,13 @@ INFLECTOR_IRREGULAR:
   child: Kinder
   sex: Geschlecht
   move: Züge
+INFLECTOR_ORDINALS:
+  default: '.'
+  first: '.'
+  second: '.'
+  third: '.'
 NICETIME:
-  NO_DATE_PROVIDED: Keine Daten vorhanden
+  NO_DATE_PROVIDED: Kein Datum angegeben
   BAD_DATE: Falsches Datum
   AGO: her
   FROM_NOW: ab jetzt
@@ -33,13 +39,14 @@ NICETIME:
   WEEK: Woche
   MONTH: Monat
   YEAR: Jahr
-  DECADE: Dekade
-  SEC: sek
-  MIN: Min
-  HR: std
-  WK: wo
-  YR: yh
-  DEC: Jz
+  DECADE: Jahrzehnt
+  SEC: Sek.
+  MIN: Min.
+  HR: Std.
+  WK: Wo.
+  MO: Mo.
+  YR: J.
+  DEC: Dek.
   SECOND_PLURAL: Sekunden
   MINUTE_PLURAL: Minuten
   HOUR_PLURAL: Stunden
@@ -47,14 +54,14 @@ NICETIME:
   WEEK_PLURAL: Wochen
   MONTH_PLURAL: Monate
   YEAR_PLURAL: Jahre
-  DECADE_PLURAL: Dekaden
+  DECADE_PLURAL: Jahrzehnte
   SEC_PLURAL: Sekunden
   MIN_PLURAL: Minuten
   HR_PLURAL: Stunden
   WK_PLURAL: Wochen
   MO_PLURAL: Monate
   YR_PLURAL: Jahre
-  DEC_PLURAL: Dekaden
+  DEC_PLURAL: Jahrzehnten
 FORM:
   VALIDATION_FAIL: '<b>Überprüfung fehlgeschlagen:</b>'
   INVALID_INPUT: Ungültige Eingabe in
@@ -68,7 +75,7 @@ MONTHS_OF_THE_YEAR:
   - Juni
   - Juli
   - August
-  - Semptember
+  - September
   - Oktober
   - November
   - Dezember
diff --git a/system/languages/el.yaml b/system/languages/el.yaml
index 2a03c9d7e..16d24cbb0 100644
--- a/system/languages/el.yaml
+++ b/system/languages/el.yaml
@@ -1,3 +1,4 @@
+---
 MONTHS_OF_THE_YEAR:
   - Ιανουάριος
   - Φεβρουάριος
@@ -13,9 +14,9 @@ MONTHS_OF_THE_YEAR:
   - Δεκέμβριος
 DAYS_OF_THE_WEEK:
   - Δευτέρα
-  - Τρλιτη
+  - Τρίτη
   - Τετάρτη
   - Πέμπτη
   - Παρασκευή
-  - Σαββάτο
+  - Σάββατο
   - Κυριακή
diff --git a/system/languages/es.yaml b/system/languages/es.yaml
index 9bfedec7f..b19b62017 100644
--- a/system/languages/es.yaml
+++ b/system/languages/es.yaml
@@ -1,3 +1,18 @@
+---
+FRONTMATTER_ERROR_PAGE: |
+  ---
+  title: %1$s
+  ---
+  
+  # Error: Frontmatter Inválido
+  
+  Ruta: `%2$s`
+  
+  **%3$s**
+  
+  ```
+  %4$s
+  ```
 INFLECTOR_UNCOUNTABLE:
   0: equipo
   1: información
diff --git a/system/languages/fi.yaml b/system/languages/fi.yaml
new file mode 100644
index 000000000..dd5a79342
--- /dev/null
+++ b/system/languages/fi.yaml
@@ -0,0 +1,60 @@
+---
+NICETIME:
+  NO_DATE_PROVIDED: Päivämäärää ei annettu
+  BAD_DATE: Virheellinen päivämäärä
+  AGO: sitten
+  FROM_NOW: tästä lähtien
+  SECOND: sekunti
+  MINUTE: minuutti
+  HOUR: tunti
+  DAY: päivä
+  WEEK: viikko
+  MONTH: kuukausi
+  YEAR: vuosi
+  DECADE: vuosikymmen
+  SEC: sek
+  MIN: min
+  HR: h
+  WK: vk
+  MO: kk
+  YR: v
+  DEC: vuosikymmen
+  SECOND_PLURAL: sekuntia
+  MINUTE_PLURAL: minuuttia
+  HOUR_PLURAL: tuntia
+  DAY_PLURAL: päivää
+  WEEK_PLURAL: viikkoa
+  MONTH_PLURAL: kuukautta
+  YEAR_PLURAL: vuotta
+  DECADE_PLURAL: vuosikymmentä
+  SEC_PLURAL: sek
+  MIN_PLURAL: min
+  HR_PLURAL: h
+  WK_PLURAL: v
+  MO_PLURAL: kk
+  YR_PLURAL: v
+  DEC_PLURAL: vuosikymmentä
+FORM:
+  VALIDATION_FAIL: '<b>Vahvistus epäonnistui:</b>'
+  MISSING_REQUIRED_FIELD: 'Puuttuva pakollinen kenttä:'
+MONTHS_OF_THE_YEAR:
+  - Tammikuu
+  - Helmikuu
+  - Maaliskuu
+  - Huhtikuu
+  - Toukokuu
+  - Kesäkuuta
+  - Heinäkuu
+  - Elokuu
+  - Syyskuu
+  - Lokakuu
+  - Marraskuu
+  - Joulukuu
+DAYS_OF_THE_WEEK:
+  - Maanantai
+  - Tiistai
+  - Keskiviikko
+  - Torstai
+  - Perjantai
+  - Lauantai
+  - Sunnuntai
diff --git a/system/languages/fr.yaml b/system/languages/fr.yaml
index c6d603885..d6dd9121b 100644
--- a/system/languages/fr.yaml
+++ b/system/languages/fr.yaml
@@ -1,14 +1,15 @@
+---
 FRONTMATTER_ERROR_PAGE: |
   ---
   title: %1$s
   ---
-
+  
   # Erreur : Frontmatter invalide
-
+  
   Path: `%2$s`
-
+  
   **%3$s**
-
+  
   ```
   %4$s
   ```
diff --git a/system/languages/hr.yaml b/system/languages/hr.yaml
index 8d4eeb125..adcdde56d 100644
--- a/system/languages/hr.yaml
+++ b/system/languages/hr.yaml
@@ -1,3 +1,4 @@
+---
 INFLECTOR_UNCOUNTABLE:
   - oprema
   - informacije
diff --git a/system/languages/hu.yaml b/system/languages/hu.yaml
index 127353eec..ae7662e23 100644
--- a/system/languages/hu.yaml
+++ b/system/languages/hu.yaml
@@ -1,17 +1,70 @@
+---
 FRONTMATTER_ERROR_PAGE: |
   ---
   cím: %1$s
   ---
-
+  
   # Hiba: Érvénytelen Frontmatter
-
+  
   Elérési út: `%2$s`
-
+  
   **%3$s**
-
+  
   ```
   %4$s
   ```
+INFLECTOR_PLURALS:
+  /(quiz)$/i: '\1zes'
+  /^(ox)$/i: '\1en'
+  "/([m|l])ouse$/i": '\1ice'
+  /(matr|vert|ind)ix|ex$/i: '\1ices'
+  /(x|ch|ss|sh)$/i: '\1es'
+  "/([^aeiouy]|qu)ies$/i": '\1y'
+  "/([^aeiouy]|qu)y$/i": '\1ies'
+  /(hive)$/i: '\1s'
+  "/(?:([^f])fe|([lr])f)$/i": '\1\2ves'
+  /sis$/i: ses
+  "/([ti])um$/i": '\1a'
+  /(buffal|tomat)o$/i: '\1oes'
+  /(bu)s$/i: '\1ses'
+  /(alias|status)/i: '\1es'
+  /(octop|vir)us$/i: '\1i'
+  /(ax|test)is$/i: '\1es'
+  /s$/i: s
+  /$/: s
+INFLECTOR_SINGULAR:
+  /(quiz)zes$/i: '\1'
+  /(matr)ices$/i: '\1ix'
+  /(vert|ind)ices$/i: '\1ex'
+  /^(ox)en/i: '\1'
+  /(alias|status)es$/i: '\1'
+  "/([octop|vir])i$/i": '\1us'
+  /(cris|ax|test)es$/i: '\1is'
+  /(shoe)s$/i: '\1'
+  /(o)es$/i: '\1'
+  /(bus)es$/i: '\1'
+  "/([m|l])ice$/i": '\1ouse'
+  /(x|ch|ss|sh)es$/i: '\1'
+  /(m)ovies$/i: '\1ovie'
+  /(s)eries$/i: '\1eries'
+  "/([^aeiouy]|qu)ies$/i": '\1y'
+  "/([lr])ves$/i": '\1f'
+  /(tive)s$/i: '\1'
+  /(hive)s$/i: '\1'
+  "/([^f])ves$/i": '\1fe'
+  /(^analy)ses$/i: '\1sis'
+  /((a)naly|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)ses$/i: '\1\2sis'
+  "/([ti])a$/i": '\1um'
+  /(n)ews$/i: '\1ews'
+INFLECTOR_UNCOUNTABLE:
+  - felszerelés
+  - információ
+  - rizs
+  - pénz
+  - fajok
+  - sorozat
+  - hal
+  - juh
 INFLECTOR_IRREGULAR:
   person: személyek
   man: férfiak
@@ -62,3 +115,24 @@ FORM:
   VALIDATION_FAIL: '<b>A validáció hibát talált:</b>'
   INVALID_INPUT: 'Az itt megadott érték érvénytelen:'
   MISSING_REQUIRED_FIELD: 'Ez a kötelező mező nincs kitöltve:'
+MONTHS_OF_THE_YEAR:
+  - január
+  - február
+  - március
+  - április
+  - május
+  - június
+  - július
+  - augusztus
+  - szeptember
+  - október
+  - november
+  - december
+DAYS_OF_THE_WEEK:
+  - hétfő
+  - kedd
+  - szerda
+  - csütörtök
+  - péntek
+  - szombat
+  - vasárnap
diff --git a/system/languages/it.yaml b/system/languages/it.yaml
index d091e8ff3..58a89989b 100644
--- a/system/languages/it.yaml
+++ b/system/languages/it.yaml
@@ -1,6 +1,8 @@
+---
+FRONTMATTER_ERROR_PAGE: "---Titolo: %1$s---# Errore: Frontmatter non valido: '%2$s' * *%3$s * * ' '%4$s ' '"
 NICETIME:
   NO_DATE_PROVIDED: Nessuna data fornita
-  BAD_DATE: Data errata
+  BAD_DATE: Data non valida
   AGO: fa
   FROM_NOW: da adesso
   SECOND: secondo
@@ -10,6 +12,14 @@ NICETIME:
   WEEK: settimana
   MONTH: mese
   YEAR: anno
+  DECADE: decennio
+  SEC: sec
+  MIN: min
+  HR: ora
+  WK: settimana
+  MO: mese
+  YR: anno
+  DEC: decennio
   SECOND_PLURAL: secondi
   MINUTE_PLURAL: minuti
   HOUR_PLURAL: ore
@@ -18,9 +28,16 @@ NICETIME:
   MONTH_PLURAL: mesi
   YEAR_PLURAL: anni
   DECADE_PLURAL: decadi
+  SEC_PLURAL: secondi
+  MIN_PLURAL: minuti
+  HR_PLURAL: ore
+  WK_PLURAL: settimane
+  MO_PLURAL: mesi
+  YR_PLURAL: anni
+  DEC_PLURAL: decenni
 FORM:
   VALIDATION_FAIL: '<b>Validazione fallita:</b>'
-  INVALID_INPUT: Input invalido in
+  INVALID_INPUT: Input non valido in
   MISSING_REQUIRED_FIELD: 'Campo richiesto mancante:'
 MONTHS_OF_THE_YEAR:
   - Gennaio
@@ -36,10 +53,10 @@ MONTHS_OF_THE_YEAR:
   - Novembre
   - Dicembre
 DAYS_OF_THE_WEEK:
-  - Lunedi
-  - Martedi
-  - Mercoledi
-  - Giovedi
-  - Venerdi
+  - Lunedì
+  - Martedì
+  - Mercoledì
+  - Giovedì
+  - Venerdì
   - Sabato
   - Domenica
diff --git a/system/languages/lt.yaml b/system/languages/lt.yaml
index fcd34ef13..6b77aa176 100644
--- a/system/languages/lt.yaml
+++ b/system/languages/lt.yaml
@@ -1,3 +1,4 @@
+---
 INFLECTOR_UNCOUNTABLE:
   2: ryžiai
   3: pinigai
diff --git a/system/languages/nl.yaml b/system/languages/nl.yaml
index 383f38cc3..757fb729f 100644
--- a/system/languages/nl.yaml
+++ b/system/languages/nl.yaml
@@ -1,3 +1,4 @@
+---
 INFLECTOR_IRREGULAR:
   person: personen
   man: mensen
@@ -13,10 +14,15 @@ NICETIME:
   MINUTE: minuut
   HOUR: uur
   DAY: dag
+  WEEK: week
   MONTH: maand
   YEAR: jaar
   DECADE: decenium
+  SEC: s
+  MIN: min
+  HR: u
   MO: ma
+  YR: j
   SECOND_PLURAL: seconden
   MINUTE_PLURAL: minuten
   HOUR_PLURAL: uren
@@ -31,15 +37,23 @@ NICETIME:
   WK_PLURAL: weken
   MO_PLURAL: maanden
   YR_PLURAL: jaren
+FORM:
+  VALIDATION_FAIL: '<b>Validatie mislukt:</b>'
+  INVALID_INPUT: Ongeldige invoer in
+  MISSING_REQUIRED_FIELD: 'Verplicht veld ontbreekt:'
 MONTHS_OF_THE_YEAR:
-  0: Januari
-  1: Februari
-  2: Maart
-  4: Mei
-  5: Juni
-  6: Juli
-  7: Augustus
-  9: Oktober
+  - Januari
+  - Februari
+  - Maart
+  - april
+  - Mei
+  - Juni
+  - Juli
+  - Augustus
+  - september
+  - Oktober
+  - november
+  - december
 DAYS_OF_THE_WEEK:
   - Maandag
   - Dinsdag
diff --git a/system/languages/no.yaml b/system/languages/no.yaml
index 41cd4b003..4a74da250 100644
--- a/system/languages/no.yaml
+++ b/system/languages/no.yaml
@@ -1,14 +1,15 @@
+---
 FRONTMATTER_ERROR_PAGE: |
   ---
   Tittel: %1$s
   ---
-
+  
   # Feilmelding: Ugyldig Frontmatter
-
+  
   Pane: '%2$s'
-
+  
   **%3$s **
-
+  
   ```
   %4$s
   ```
@@ -62,7 +63,9 @@ NICETIME:
   MIN_PLURAL: min
   HR_PLURAL: timer
   WK_PLURAL: uker
+  MO_PLURAL: mdr
   YR_PLURAL: år
+  DEC_PLURAL: årtier
 FORM:
   VALIDATION_FAIL: '<b>Validering mislyktes:</b>'
   INVALID_INPUT: Ugyldig innhold i
diff --git a/system/languages/pl.yaml b/system/languages/pl.yaml
index 9aac0940c..6a479bf59 100644
--- a/system/languages/pl.yaml
+++ b/system/languages/pl.yaml
@@ -1,14 +1,15 @@
+---
 FRONTMATTER_ERROR_PAGE: |
   ---
   title: %1$s
   ---
-
+  
   # Error: Nieprawidłowy Frontmatter
-
+  
   Path: `%2$s`
-
+  
   **%3$s**
-
+  
   ```
   %4$s
   ```
@@ -28,8 +29,8 @@ NICETIME:
   SEC: sek
   MIN: min
   HR: godz
-  WK: tydź
-  MO: mieś
+  WK: tydz
+  MO: m-c
   YR: rok
   DEC: dekada
   SECOND_PLURAL: sekund
@@ -40,16 +41,16 @@ NICETIME:
   MONTH_PLURAL: miesięcy
   YEAR_PLURAL: lat
   DECADE_PLURAL: dekad
-  SEC_PLURAL: sekund
-  MIN_PLURAL: minut
+  SEC_PLURAL: sek
+  MIN_PLURAL: min
   HR_PLURAL: godz
   WK_PLURAL: tyg
-  MO_PLURAL: mieś
+  MO_PLURAL: m-ce
   YR_PLURAL: lat
   DEC_PLURAL: dekad
 FORM:
   VALIDATION_FAIL: '<b>Weryfikacja nie powiodła się:</b>'
-  INVALID_INPUT: Nieprawidłowe dane w
+  INVALID_INPUT: Nieprawidłowe dane wejściowe
   MISSING_REQUIRED_FIELD: 'Opuszczono wymagane pole:'
 MONTHS_OF_THE_YEAR:
   - Styczeń
diff --git a/system/languages/pt.yaml b/system/languages/pt.yaml
index f108e992c..a9da66a02 100644
--- a/system/languages/pt.yaml
+++ b/system/languages/pt.yaml
@@ -1,3 +1,18 @@
+---
+FRONTMATTER_ERROR_PAGE: |
+  ---
+  título: %1$s
+  ---
+  
+  # Erro: Frontmatter inválida
+  
+  Caminho: `%2$s`
+  
+  **%3$s**
+  
+  ```
+  %4$s
+  ```
 INFLECTOR_UNCOUNTABLE:
   1: informação
   2: arroz
@@ -6,6 +21,10 @@ INFLECTOR_IRREGULAR:
   man: homens
   sex: sexos
 NICETIME:
+  NO_DATE_PROVIDED: Não foi fornecida data
+  BAD_DATE: Data inválida
+  AGO: atrás
+  FROM_NOW: a partir de agora
   SECOND: segundo
   MINUTE: minuto
   HOUR: hora
@@ -16,8 +35,11 @@ NICETIME:
   DECADE: década
   SEC: seg
   MIN: mín
-  MO: mês
-  YR: ano
+  HR: h
+  WK: sem
+  MO: m
+  YR: a
+  DEC: dec
   SECOND_PLURAL: segundos
   MINUTE_PLURAL: minutos
   HOUR_PLURAL: horas
@@ -29,9 +51,11 @@ NICETIME:
   SEC_PLURAL: seg
   MIN_PLURAL: mins
   HR_PLURAL: hrs
+  WK_PLURAL: sems
   YR_PLURAL: anos
 FORM:
   VALIDATION_FAIL: '<b>Validação falhada: </b>'
+  MISSING_REQUIRED_FIELD: 'Campo obrigatório ausente:'
 MONTHS_OF_THE_YEAR:
   - Janeiro
   - Fevereiro
diff --git a/system/languages/ro.yaml b/system/languages/ro.yaml
index a95fcde0b..a84a3c2cf 100644
--- a/system/languages/ro.yaml
+++ b/system/languages/ro.yaml
@@ -1,18 +1,99 @@
+---
+FRONTMATTER_ERROR_PAGE: |
+  ---
+  Titlu: %1$s
+  ---
+  # Eroare: Frontmatter este invalid
+  
+  Calea: `%2$s`
+  
+  **%3$s**
+  
+  ```
+  %4$s
+INFLECTOR_PLURALS:
+  /(quiz)$/i: '\1zes'
+  /^(ox)$/i: '\1en'
+  "/([m|l])ouse$/i": '\1ice'
+  /(matr|vert|ind)ix|ex$/i: '\1ices'
+  /(x|ch|ss|sh)$/i: '\1es'
+  "/([^aeiouy]|qu)ies$/i": '\1y'
+  "/([^aeiouy]|qu)y$/i": '\1ies'
+  /(hive)$/i: '\1s'
+  "/(?:([^f])fe|([lr])f)$/i": '\1\2ves'
+  /sis$/i: ses
+  "/([ti])um$/i": '\1a'
+  /(buffal|tomat)o$/i: '\1oes'
+INFLECTOR_UNCOUNTABLE:
+  - echipament
+  - informaţie
+  - orez
+  - bani
+  - specii
+  - serii
+  - peşte
+  - oaie
+INFLECTOR_IRREGULAR:
+  person: persoane
+  man: bărbați
+  child: copii
+  sex: sexe
+  move: mutări
+NICETIME:
+  NO_DATE_PROVIDED: Nu există o dată prevăzută
+  BAD_DATE: Dată incorectă
+  AGO: în urmă
+  FROM_NOW: de acum
+  SECOND: secundă
+  MINUTE: minut
+  HOUR: oră
+  DAY: zi
+  WEEK: săptămână
+  MONTH: lună
+  YEAR: an
+  DECADE: decadă
+  SEC: sec
+  MIN: min
+  HR: oră
+  WK: săpt
+  MO: lună
+  YR: an
+  DEC: decadă
+  SECOND_PLURAL: secunde
+  MINUTE_PLURAL: minute
+  HOUR_PLURAL: ore
+  DAY_PLURAL: zile
+  WEEK_PLURAL: săptămâni
+  MONTH_PLURAL: luni
+  YEAR_PLURAL: ani
+  DECADE_PLURAL: decade
+  SEC_PLURAL: sec
+  MIN_PLURAL: min
+  HR_PLURAL: ore
+  WK_PLURAL: săpt
+  MO_PLURAL: luni
+  YR_PLURAL: ani
+  DEC_PLURAL: decenii
+FORM:
+  VALIDATION_FAIL: '<b>Validare nereușită</b>'
+  INVALID_INPUT: Date incorecte în
+  MISSING_REQUIRED_FIELD: 'Câmp obligatoriu lipsă:'
 MONTHS_OF_THE_YEAR:
-  0: Ianuarie
-  1: Februarie
-  2: Martie
-  3: Aprilue
-  4: Mai
-  5: Iunie
-  6: Iulie
-  8: Septembrie
-  9: Octombrie
-  10: Noiembrie
-  11: Decembrie
+  - Ianuarie
+  - Februarie
+  - Martie
+  - Aprilie
+  - Mai
+  - Iunie
+  - Iulie
+  - August
+  - Septembrie
+  - Octombrie
+  - Noiembrie
+  - Decembrie
 DAYS_OF_THE_WEEK:
   - Luni
-  - Marti
+  - Marți
   - Miercuri
   - Joi
   - Vineri
diff --git a/system/languages/ru.yaml b/system/languages/ru.yaml
index 6f7600c04..c8ba63e27 100644
--- a/system/languages/ru.yaml
+++ b/system/languages/ru.yaml
@@ -1,3 +1,18 @@
+---
+FRONTMATTER_ERROR_PAGE: |
+  ---
+  title: %1$s
+  ---
+  
+  # Ошибка: Недопустимое содержимое
+  
+  Path: `%2$s`
+  
+  **%3$s**
+  
+  ```
+  %4$s
+  ```
 INFLECTOR_IRREGULAR:
   person: люди
   man: человек
@@ -20,8 +35,8 @@ NICETIME:
   SEC: с
   MIN: мин
   HR: ч
-  WK: нед
-  MO: мес
+  WK: нед.
+  MO: мес.
   YR: г.
   DEC: гг.
   SECOND_PLURAL: секунды
diff --git a/system/languages/sk.yaml b/system/languages/sk.yaml
new file mode 100644
index 000000000..8651e7f50
--- /dev/null
+++ b/system/languages/sk.yaml
@@ -0,0 +1,42 @@
+---
+NICETIME:
+  NO_DATE_PROVIDED: Neposkytnutý žiaden dátum
+  BAD_DATE: Nesprávny dátum
+  AGO: pred
+  FROM_NOW: odteraz
+  SECOND: sekunda
+  MINUTE: minúta
+  HOUR: hodina
+  DAY: deň
+  WEEK: týždeň
+  MONTH: mesiac
+  YEAR: rok
+  DECADE: desaťročie
+  SEC: sek
+  MIN: min
+  HR: hod
+FORM:
+  VALIDATION_FAIL: '<b>Overenie zlyhalo:</b>'
+  INVALID_INPUT: Neplatný vstup v
+  MISSING_REQUIRED_FIELD: 'Chýba vyžadované pole:'
+MONTHS_OF_THE_YEAR:
+  - Január
+  - Február
+  - Marec
+  - Apríl
+  - Máj
+  - Jún
+  - Júl
+  - August
+  - September
+  - Október
+  - November
+  - December
+DAYS_OF_THE_WEEK:
+  - Pondelok
+  - Utorok
+  - Streda
+  - Štvrtok
+  - Piatok
+  - Sobota
+  - Nedeľa
diff --git a/system/languages/sv.yaml b/system/languages/sv.yaml
index 648167849..8212eb392 100644
--- a/system/languages/sv.yaml
+++ b/system/languages/sv.yaml
@@ -1,2 +1,62 @@
+---
+FRONTMATTER_ERROR_PAGE: '--- titel: %1$s --- # Fel: Ogiltig Frontmatter-sökväg: `%2$s` **%3$s** ``` %4$s ```'
 NICETIME:
+  NO_DATE_PROVIDED: Inget datum har angivits
+  BAD_DATE: Ogiltigt datum
+  AGO: sedan
+  FROM_NOW: från nu
+  SECOND: sekund
+  MINUTE: minut
+  HOUR: timme
   DAY: dag
+  WEEK: vecka
+  MONTH: månad
+  YEAR: år
+  DECADE: årtionde
+  SEC: sek
+  MIN: min
+  HR: t
+  WK: v
+  MO: m
+  YR: år
+  DEC: dec
+  SECOND_PLURAL: sekunder
+  MINUTE_PLURAL: minuter
+  HOUR_PLURAL: timmar
+  DAY_PLURAL: dagar
+  WEEK_PLURAL: veckor
+  MONTH_PLURAL: månader
+  YEAR_PLURAL: år
+  DECADE_PLURAL: årtionden
+  SEC_PLURAL: sek
+  MIN_PLURAL: min
+  HR_PLURAL: t
+  WK_PLURAL: v
+  MO_PLURAL: må
+  YR_PLURAL: år
+  DEC_PLURAL: dec
+FORM:
+  VALIDATION_FAIL: '<b>Kontrollen misslyckades:</b>'
+  INVALID_INPUT: Ogiltig indata i
+  MISSING_REQUIRED_FIELD: 'Obligatoriskt fält måste fyllas i:'
+MONTHS_OF_THE_YEAR:
+  - Januari
+  - Februrari
+  - Mars
+  - April
+  - Maj
+  - Juni
+  - Juli
+  - Augusti
+  - September
+  - Oktober
+  - November
+  - December
+DAYS_OF_THE_WEEK:
+  - Måndag
+  - Tisdag
+  - Onsdag
+  - Torsdag
+  - Fredag
+  - Lördag
+  - Söndag
diff --git a/system/languages/th.yaml b/system/languages/th.yaml
new file mode 100644
index 000000000..d0023c298
--- /dev/null
+++ b/system/languages/th.yaml
@@ -0,0 +1,75 @@
+---
+FRONTMATTER_ERROR_PAGE: |
+  ---
+  ชื่อเรื่อง: %1$s
+  ---
+  
+  # ข้อผิดพลาด: Invalid Frontmatter
+  
+  Path: `%2$s`
+  
+  **%3$s**
+  
+  ```
+  %4$s
+  ```
+NICETIME:
+  NO_DATE_PROVIDED: ไม่มีวันที่ให้
+  BAD_DATE: รูปแบบวันที่ผิด
+  AGO: ที่ผ่านมา
+  FROM_NOW: จากตอนนี้
+  SECOND: วินาที
+  MINUTE: นาที
+  HOUR: ชั่วโมง
+  DAY: วัน
+  WEEK: สัปดาห์
+  MONTH: เดือน
+  YEAR: ปี
+  DECADE: ทศวรรษที่ผ่านมา
+  SEC: วิ
+  MIN: นาที
+  HR: ชม.
+  WK: wk
+  MO: mo
+  YR: yr
+  DEC: dec
+  SECOND_PLURAL: วินาที
+  MINUTE_PLURAL: นาที
+  HOUR_PLURAL: ชั่วโมง
+  DAY_PLURAL: วัน
+  WEEK_PLURAL: สัปดาห์
+  MONTH_PLURAL: เดือน
+  YEAR_PLURAL: ปี
+  DECADE_PLURAL: ทศวรรษที่ผ่านมา
+  SEC_PLURAL: วินาที
+  MIN_PLURAL: นาที
+  HR_PLURAL: ชั่วโมง
+  WK_PLURAL: wks
+  MO_PLURAL: mos
+  YR_PLURAL: ปี
+  DEC_PLURAL: decs
+FORM:
+  VALIDATION_FAIL: '<b>ตรวจสอบล้มเหลว: </b>'
+  INVALID_INPUT: ป้อนข้อมูลไม่ถูกต้องใน
+  MISSING_REQUIRED_FIELD: 'ขาดข้อมูลที่จำเป็น:'
+MONTHS_OF_THE_YEAR:
+  - มกราคม
+  - กุมภาพันธ์
+  - มีนาคม
+  - เมษายน
+  - พฤษภาคม
+  - มิถุนายน
+  - กรกฏาคม
+  - สิงหาคม
+  - กันยายน
+  - ตุลาคม
+  - พฤศจิกายน
+  - ธันวาคม
+DAYS_OF_THE_WEEK:
+  - จันทร์
+  - อังคาร
+  - พุธ
+  - พฤหัสบดี
+  - ศุกร์
+  - เสาร์
+  - อาทิตย์
diff --git a/system/languages/tr.yaml b/system/languages/tr.yaml
index 28bb5c58b..68e3a8569 100644
--- a/system/languages/tr.yaml
+++ b/system/languages/tr.yaml
@@ -1,3 +1,4 @@
+---
 NICETIME:
   NO_DATE_PROVIDED: Tarih yok
   BAD_DATE: Yanlış tarih
@@ -33,3 +34,26 @@ NICETIME:
   MO_PLURAL: ay
   YR_PLURAL: yl
   DEC_PLURAL: onyl
+FORM:
+  VALIDATION_FAIL: '<b>Doğrulama başarısız:</b>'
+MONTHS_OF_THE_YEAR:
+  - Ocak
+  - Şubat
+  - Mart
+  - Nisan
+  - Mayıs
+  - Haziran
+  - Temmuz
+  - Ağustos
+  - Eylül
+  - Ekim
+  - Kasım
+  - Aralık
+DAYS_OF_THE_WEEK:
+  - Pazartesi
+  - Salı
+  - Çarşamba
+  - Perşembe
+  - Cuma
+  - Cumartesi
+  - Pazar
diff --git a/system/languages/uk.yaml b/system/languages/uk.yaml
new file mode 100644
index 000000000..8ab79919b
--- /dev/null
+++ b/system/languages/uk.yaml
@@ -0,0 +1,75 @@
+---
+FRONTMATTER_ERROR_PAGE: |
+  ---
+  title: %1$s
+  ---
+  
+  # Помилка: Недопустимий вміст
+  
+  Path: `%2$s`
+  
+  **%3$s**
+  
+  ```
+  %4$s
+  ```
+NICETIME:
+  NO_DATE_PROVIDED: Не вказана дата
+  BAD_DATE: Невірна дата
+  AGO: назад
+  FROM_NOW: відтепер
+  SECOND: секунда
+  MINUTE: хвилина
+  HOUR: година
+  DAY: день
+  WEEK: тиждень
+  MONTH: місяць
+  YEAR: рік
+  DECADE: десятиріччя
+  SEC: с
+  MIN: хв
+  HR: год
+  WK: тиж.
+  MO: міс.
+  YR: р.
+  DEC: рр.
+  SECOND_PLURAL: секунди
+  MINUTE_PLURAL: хвилини
+  HOUR_PLURAL: години
+  DAY_PLURAL: дні
+  WEEK_PLURAL: тижні
+  MONTH_PLURAL: місяці
+  YEAR_PLURAL: роки
+  DECADE_PLURAL: десятиріччя
+  SEC_PLURAL: с
+  MIN_PLURAL: хв
+  HR_PLURAL: год
+  WK_PLURAL: тиж.
+  MO_PLURAL: міс.
+  YR_PLURAL: рр.
+  DEC_PLURAL: рр.
+FORM:
+  VALIDATION_FAIL: '<b>Перевірка не вдалася:</b>'
+  INVALID_INPUT: Невірне введення в
+  MISSING_REQUIRED_FIELD: 'Відсутнє необхідне поле:'
+MONTHS_OF_THE_YEAR:
+  - Січень
+  - Лютий
+  - Березень
+  - Квітень
+  - Травень
+  - Червень
+  - Липень
+  - Серпень
+  - Вересень
+  - Жовтень
+  - Листопад
+  - Грудень
+DAYS_OF_THE_WEEK:
+  - Понеділок
+  - Вівторок
+  - Середа
+  - Четвер
+  - "П'ятниця"
+  - Субота
+  - Неділя
diff --git a/system/languages/vi.yaml b/system/languages/vi.yaml
new file mode 100644
index 000000000..e4269939f
--- /dev/null
+++ b/system/languages/vi.yaml
@@ -0,0 +1,75 @@
+---
+FRONTMATTER_ERROR_PAGE: |
+  ---
+  title: %1$s
+  ---
+  
+  # Error: Invalid Frontmatter
+  
+  Path: `%2$s`
+  
+  **%3$s**
+  
+  ```
+  %4$s
+  ```
+NICETIME:
+  NO_DATE_PROVIDED: Không có ngày được cung cấp
+  BAD_DATE: Ngày không hợp lệ
+  AGO: cách đây
+  FROM_NOW: từ bây giờ
+  SECOND: giây
+  MINUTE: phút
+  HOUR: giờ
+  DAY: ngày
+  WEEK: tuần
+  MONTH: tháng
+  YEAR: năm
+  DECADE: thập kỷ
+  SEC: giây
+  MIN: phút
+  HR: giờ
+  WK: tuần
+  MO: tháng
+  YR: năm
+  DEC: thập kỷ
+  SECOND_PLURAL: giây
+  MINUTE_PLURAL: phút
+  HOUR_PLURAL: giờ
+  DAY_PLURAL: ngày
+  WEEK_PLURAL: tuần
+  MONTH_PLURAL: tháng
+  YEAR_PLURAL: năm
+  DECADE_PLURAL: thập kỷ
+  SEC_PLURAL: giây
+  MIN_PLURAL: phút
+  HR_PLURAL: giờ
+  WK_PLURAL: tuần
+  MO_PLURAL: tháng
+  YR_PLURAL: năm
+  DEC_PLURAL: thập kỷ
+FORM:
+  VALIDATION_FAIL: '<b>Xác nhận thất bại:</b>'
+  INVALID_INPUT: Dữ liệu nhập không hợp lệ cho
+  MISSING_REQUIRED_FIELD: 'Thiếu trường bắt buộc:'
+MONTHS_OF_THE_YEAR:
+  - Tháng 1
+  - Tháng 2
+  - Tháng 3
+  - Tháng 4
+  - Tháng 5
+  - Tháng 6
+  - Tháng 7
+  - Tháng 8
+  - Tháng 9
+  - Tháng 10
+  - Tháng Mười 11
+  - Tháng 12
+DAYS_OF_THE_WEEK:
+  - Thứ 2
+  - Thứ 3
+  - Thứ 4
+  - Thứ 5
+  - Thứ 6
+  - Thứ 7
+  - Chủ Nhật
diff --git a/system/src/Grav/Common/Language/LanguageCodes.php b/system/src/Grav/Common/Language/LanguageCodes.php
index 09f4b07f9..ad278c24b 100644
--- a/system/src/Grav/Common/Language/LanguageCodes.php
+++ b/system/src/Grav/Common/Language/LanguageCodes.php
@@ -22,8 +22,8 @@ class LanguageCodes
         'bn-BD'      => [ 'name' => 'Bengali (Bangladesh)',      'nativeName' => 'বাংলা (বাংলাদেশ)' ],
         'bn-IN'      => [ 'name' => 'Bengali (India)',           'nativeName' => 'বাংলা (ভারত)' ],
         'br'         => [ 'name' => 'Breton',                    'nativeName' => 'Brezhoneg' ],
-        'ca'         => [ 'name' => 'Catalan',                   'nativeName' => 'català' ],
-        'ca-valencia'=> [ 'name' => 'Catalan (Valencian)',       'nativeName' => 'català (valencià)' ], // not iso-639-1. a=l10n-drivers
+        'ca'         => [ 'name' => 'Catalan',                   'nativeName' => 'Català' ],
+        'ca-valencia'=> [ 'name' => 'Catalan (Valencian)',       'nativeName' => 'Català (valencià)' ], // not iso-639-1. a=l10n-drivers
         'cs'         => [ 'name' => 'Czech',                     'nativeName' => 'Čeština' ],
         'cy'         => [ 'name' => 'Welsh',                     'nativeName' => 'Cymraeg' ],
         'da'         => [ 'name' => 'Danish',                    'nativeName' => 'Dansk' ],
@@ -49,7 +49,7 @@ class LanguageCodes
         'et'         => [ 'name' => 'Estonian',                  'nativeName' => 'Eesti keel' ],
         'eu'         => [ 'name' => 'Basque',                    'nativeName' => 'Euskara' ],
         'fa'         => [ 'name' => 'Persian',                   'nativeName' => 'فارسی' ],
-        'fi'         => [ 'name' => 'Finnish',                   'nativeName' => 'suomi' ],
+        'fi'         => [ 'name' => 'Finnish',                   'nativeName' => 'Suomi' ],
         'fj-FJ'      => [ 'name' => 'Fijian',                    'nativeName' => 'Vosa vaka-Viti' ],
         'fr'         => [ 'name' => 'French',                    'nativeName' => 'Français' ],
         'fur'        => [ 'name' => 'Friulian',                  'nativeName' => 'Furlan' ],
@@ -83,7 +83,7 @@ class LanguageCodes
         'la'         => [ 'name' => 'Latin',                     'nativeName' => 'Latina' ],
         'lb'         => [ 'name' => 'Luxembourgish',             'nativeName' => 'Lëtzebuergesch' ],
         'lg'         => [ 'name' => 'Luganda',                   'nativeName' => 'Luganda' ],
-        'lt'         => [ 'name' => 'Lithuanian',                'nativeName' => 'lietuvių kalba' ],
+        'lt'         => [ 'name' => 'Lithuanian',                'nativeName' => 'Lietuvių kalba' ],
         'lv'         => [ 'name' => 'Latvian',                   'nativeName' => 'Latviešu' ],
         'mai'        => [ 'name' => 'Maithili',                  'nativeName' => 'मैथिली মৈথিলী' ],
         'mg'         => [ 'name' => 'Malagasy',                  'nativeName' => 'Malagasy' ],
@@ -92,14 +92,15 @@ class LanguageCodes
         'ml'         => [ 'name' => 'Malayalam',                 'nativeName' => 'മലയാളം' ],
         'mn'         => [ 'name' => 'Mongolian',                 'nativeName' => 'Монгол' ],
         'mr'         => [ 'name' => 'Marathi',                   'nativeName' => 'मराठी' ],
+        'no'         => [ 'name' => 'Norwegian',                 'nativeName' => 'Norsk' ],
         'nb'         => [ 'name' => 'Norwegian',                 'nativeName' => 'Norsk' ],
         'nb-NO'      => [ 'name' => 'Norwegian (Bokmål)',        'nativeName' => 'Norsk bokmål' ],
         'ne-NP'      => [ 'name' => 'Nepali',                    'nativeName' => 'नेपाली' ],
         'nn-NO'      => [ 'name' => 'Norwegian (Nynorsk)',       'nativeName' => 'Norsk nynorsk' ],
         'nl'         => [ 'name' => 'Dutch',                     'nativeName' => 'Nederlands' ],
-        'nr'         => [ 'name' => 'Ndebele, South',            'nativeName' => 'isiNdebele' ],
+        'nr'         => [ 'name' => 'Ndebele, South',            'nativeName' => 'IsiNdebele' ],
         'nso'        => [ 'name' => 'Northern Sotho',            'nativeName' => 'Sepedi' ],
-        'oc'         => [ 'name' => 'Occitan (Lengadocian)',     'nativeName' => 'occitan (lengadocian)' ],
+        'oc'         => [ 'name' => 'Occitan (Lengadocian)',     'nativeName' => 'Occitan (lengadocian)' ],
         'or'         => [ 'name' => 'Oriya',                     'nativeName' => 'ଓଡ଼ିଆ' ],
         'pa'         => [ 'name' => 'Punjabi',                   'nativeName' => 'ਪੰਜਾਬੀ' ],
         'pa-IN'      => [ 'name' => 'Punjabi',                   'nativeName' => 'ਪੰਜਾਬੀ' ],
@@ -107,13 +108,13 @@ class LanguageCodes
         'pt'         => [ 'name' => 'Portuguese',                'nativeName' => 'Português' ],
         'pt-BR'      => [ 'name' => 'Portuguese (Brazilian)',    'nativeName' => 'Português (do Brasil)' ],
         'pt-PT'      => [ 'name' => 'Portuguese (Portugal)',     'nativeName' => 'Português (Europeu)' ],
-        'ro'         => [ 'name' => 'Romanian',                  'nativeName' => 'română' ],
-        'rm'         => [ 'name' => 'Romansh',                   'nativeName' => 'rumantsch' ],
+        'ro'         => [ 'name' => 'Romanian',                  'nativeName' => 'Română' ],
+        'rm'         => [ 'name' => 'Romansh',                   'nativeName' => 'Rumantsch' ],
         'ru'         => [ 'name' => 'Russian',                   'nativeName' => 'Русский' ],
         'rw'         => [ 'name' => 'Kinyarwanda',               'nativeName' => 'Ikinyarwanda' ],
         'si'         => [ 'name' => 'Sinhala',                   'nativeName' => 'සිංහල' ],
-        'sk'         => [ 'name' => 'Slovak',                    'nativeName' => 'slovenčina' ],
-        'sl'         => [ 'name' => 'Slovenian',                 'nativeName' => 'slovensko' ],
+        'sk'         => [ 'name' => 'Slovak',                    'nativeName' => 'Slovenčina' ],
+        'sl'         => [ 'name' => 'Slovenian',                 'nativeName' => 'Slovensko' ],
         'son'        => [ 'name' => 'Songhai',                   'nativeName' => 'Soŋay' ],
         'sq'         => [ 'name' => 'Albanian',                  'nativeName' => 'Shqip' ],
         'sr'         => [ 'name' => 'Serbian',                   'nativeName' => 'Српски' ],
@@ -127,6 +128,7 @@ class LanguageCodes
         'ta-LK'      => [ 'name' => 'Tamil (Sri Lanka)',         'nativeName' => 'தமிழ் (இலங்கை)' ],
         'te'         => [ 'name' => 'Telugu',                    'nativeName' => 'తెలుగు' ],
         'th'         => [ 'name' => 'Thai',                      'nativeName' => 'ไทย' ],
+        'tlh'        => [ 'name' => 'Klingon',                   'nativeName' => 'Klingon' ],
         'tn'         => [ 'name' => 'Tswana',                    'nativeName' => 'Setswana' ],
         'tr'         => [ 'name' => 'Turkish',                   'nativeName' => 'Türkçe' ],
         'ts'         => [ 'name' => 'Tsonga',                    'nativeName' => 'Xitsonga' ],