Language: Add support for user or course language using get_lang and gettext - refs GH#2323

Author: @christianbeeznest

public/main/inc/lib/internationalization.lib.php

@@ -66,10 +66,19 @@ function get_lang($variable)
         return $variable;
     }
 
-    // Using symfony
-    $defaultDomain = 'messages';
     $locale = api_get_language_isocode();
+    $userInfo = api_get_user_info();
+    if (isset($userInfo)) {
+        $locale = $userInfo['language'];
+    }
 
+    $courseInfo = api_get_course_info();
+    if (isset($courseInfo)) {
+        $locale = $courseInfo['language'];
+    }
+
+    // Using symfony
+    $defaultDomain = 'messages';
     return $translator->trans(
         $variable,
         [],