diff --git a/README.references.txt b/README.references.txt
index ea57dfd..4e0452f 100644
--- a/README.references.txt
+++ b/README.references.txt
@@ -1,5 +1,17 @@
 #<script>
 
+
+Translations
+============
+
+https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Internationalization
+
+
+
+
+
+
+
 Notifier
 
 https://stackoverflow.com/questions/52935526/kstatusnotifieritem-instantiation-crashes-qt
diff --git a/webext/_locales/en-US/messages.json b/webext/_locales/en_US/messages.json
similarity index 100%
rename from webext/_locales/en-US/messages.json
rename to webext/_locales/en_US/messages.json
diff --git a/webext/_locales/nl/messages.json b/webext/_locales/nl/messages.json
new file mode 100644
index 0000000..8226c55
--- /dev/null
+++ b/webext/_locales/nl/messages.json
@@ -0,0 +1,31 @@
+{
+  "extension_name": {
+    "message": "SysTray-X",
+    "description": "Name of the webextension"
+  },
+
+  "extension_description": {
+    "message": "Systeemvak besturings addon. Download ook de bijbehorende app.",
+    "description": "Webextension descriptions"
+  },
+
+  "tab_windows": {
+    "message": "Vensters",
+    "description": "Tab for Window options"
+  },
+
+  "tab_icon": {
+    "message": "Pictogrammen",
+    "description": "Tab for Icon options"
+  },
+
+  "tab_mail": {
+    "message": "Berichten",
+    "description": "Tab for Mail options"
+  },
+
+  "tab_debug": {
+    "message": "Debug",
+    "description": "Tab for Debug options"
+  }
+}
diff --git a/webext/manifest.json b/webext/manifest.json
index 27cfbcc..880f5dd 100644
--- a/webext/manifest.json
+++ b/webext/manifest.json
@@ -18,7 +18,7 @@
     "48": "icons/message.svg"
   },
 
-  "default_locale": "en-US",
+  "default_locale": "en_US",
 
   "permissions": [
     "accountsRead",