Refactoring gone bad, patch to correct

[palgarvio]

The correct refactoring would have been:

trac/web/main.py

@@ -276 +276 @@
                 translation.get_available_locales()]
 
             preferred = req.session.get('language', req.languages)
-            if isinstance(preferred, list):
+            if not isinstance(preferred, list):
                 preferred = [preferred]
             return Locale.negotiate(preferred, available, sep='-')

[jruigrok]

Fixed in r7412. Thanks.