Do not create zh_TW and zh_CN from translate toolkit

Rather use zh_Hant and zh_Hans instead.

Fixes #859
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/lang/data.py

@@ -739,3 +739,8 @@ LOCALE_ALIASES = {
     'zh_cn': 'zh_Hans',
     'zh_tw': 'zh_Hant',
 }
+
+# List of languages we do not want to import from translate-toolkit
+SKIP_TRANSLATE_TOOLKIT = frozenset((
+    'zh_CN', 'zh_TW',
+))

weblate/lang/models.py

@@ -241,6 +241,8 @@ class LanguageManager(models.Manager):
 
         # Languages from ttkit
         for code, props in languages.items():
+            if code in data.SKIP_TRANSLATE_TOOLKIT:
+                continue
             lang, created = Language.objects.get_or_create(
                 code=code
             )