Hotfix 1.3.7.1

system/Settings.php

@@ -95,7 +95,7 @@ class Settings
 	}
 
 
-  	public function whichLanguage()
+  	public static function whichLanguage()
   	{
     	# Check which languages are available
     	$langs = [];

system/Translations.php

@@ -86,4 +86,4 @@ class Translations
     return $labels;
   }
 
-}
+}