diff --git a/system/src/Grav/Common/Data/Blueprint.php b/system/src/Grav/Common/Data/Blueprint.php
index bf1f5a32f..9bfc32303 100644
--- a/system/src/Grav/Common/Data/Blueprint.php
+++ b/system/src/Grav/Common/Data/Blueprint.php
@@ -77,7 +77,8 @@ class Blueprint
             $this->validateArray($data, $this->nested);
         } catch (\RuntimeException $e) {
             $language = self::getGrav()['language'];
-            throw new \RuntimeException(sprintf('<b>Validation failed:</b> %s', $language->translate($e->getMessage())));
+            $message = sprintf($language->translate('FORM.VALIDATION_FAIL', null, true) . ' %s', $e->getMessage());
+            throw new \RuntimeException($message);
         }
     }