Add fallback if getting supybot.language from registry cache failed.

src/i18n.py

@@ -57,7 +57,10 @@ def getLocaleFromRegistryCache():
     loaded."""
     global currentLocale
     import supybot.registry as registry
+    try:
         currentLocale = registry._cache['supybot.language']
+    except KeyError:
+        pass
 
 def import_conf():
     """Imports the conf into this module"""