diff --git a/kallithea/config/app_cfg.py b/kallithea/config/app_cfg.py
--- a/kallithea/config/app_cfg.py
+++ b/kallithea/config/app_cfg.py
@@ -98,10 +98,8 @@ class KallitheaAppConfig(AppConfig):
         # Disable transaction manager -- currently Kallithea takes care of transactions itself
         self['tm.enabled'] = False
 
-        # Set the i18n source language so TG doesn't search beyond 'en' in Accept-Language.
-        # Don't force the default here if configuration force something else.
-        if not self.get('i18n.lang'):
-            self['i18n.lang'] = 'en'
+        # Set the default i18n source language so TG doesn't search beyond 'en' in Accept-Language.
+        self['i18n.lang'] = 'en'
 
 
 base_config = KallitheaAppConfig()