Use lower case language codes

Otherewise the Django autodetection doesn't work as expected.

Fixes #929
Signed-off-by: Michal Čihař <michal@cihar.com>

scripts/list-translated-languages

@@ -34,7 +34,7 @@ def main():
     languages = []
     for lang in data:
         if lang['translated_percent'] > THRESHOLD:
-            code = lang['code'].replace('_', '-')
+            code = lang['code'].replace('_', '-').lower()
             languages.append(code)
     languages.sort()
     print 'Expected setup:'

weblate/settings_example.py

@@ -105,7 +105,7 @@ LANGUAGES = (
     ('nl', u'Nederlands'),
     ('pl', u'Polski'),
     ('pt', u'Português'),
-    ('pt-BR', u'Português brasileiro'),
+    ('pt-br', u'Português brasileiro'),
     ('ru', u'Русский'),
     ('sk', u'Slovenčina'),
     ('sl', u'Slovenščina'),
@@ -113,8 +113,8 @@ LANGUAGES = (
     ('sv', u'Svenska'),
     ('tr', u'Türkçe'),
     ('uk', u'Українська'),
-    ('zh-Hans', u'简体字'),
-    ('zh-Hant', u'正體字'),
+    ('zh-hans', u'简体字'),
+    ('zh-hant', u'正體字'),
 )
 
 SITE_ID = 1