Improve language alias matching

- do it case insensitive
- do it regardless separator
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/lang/data.py

@@ -726,9 +726,9 @@ LOCALE_ALIASES = {
     'german': 'de',
     'french': 'fr',
     # Android
-    'be-rBY': 'be@latin',
+    'be-rby': 'be@latin',
     # Misc invalid codes
-    'val-ES': 'ca@valencia',
+    'val_es': 'ca@valencia',
     'jp': 'ja',
     # Old locale codes
     'iw': 'he',
@@ -736,11 +736,11 @@ LOCALE_ALIASES = {
     'in': 'id',
     # Prefer new variants
     'sr@latin': 'sr_Latn',
-    'sr_RS@latin': 'sr_Latn',
+    'sr_rs@latin': 'sr_Latn',
     'sr@cyrillic': 'sr_Cyrl',
-    'sr_RS@cyrillic': 'sr_Cyrl',
-    'zh_CN': 'zh_Hans',
-    'zh_TW': 'zh_Hant',
+    'sr_rs@cyrillic': 'sr_Cyrl',
+    'zh_cn': 'zh_Hans',
+    'zh_tw': 'zh_Hant',
 }
 
 # List of languages we do not want to import from translate-toolkit

weblate/lang/models.py

@@ -132,6 +132,21 @@ class LanguageManager(models.Manager):
             code = code[:-1]
         return code
 
+    def aliases_get(self, code):
+        code = code.lower()
+        codes = (
+            code,
+            code.replace('-', '_'),
+            code.replace('-r', '_')
+        )
+        for newcode in codes:
+            if newcode in data.LOCALE_ALIASES:
+                newcode = data.LOCALE_ALIASES[newcode]
+                ret = self.try_get(code=newcode)
+                if ret is not None:
+                    return ret
+        return None
+
     def fuzzy_get(self, code):
         '''
         Gets matching language for code (the code does not have to be exactly
@@ -152,12 +167,9 @@ class LanguageManager(models.Manager):
             return ret
 
         # Handle aliases
-        for newcode in (code, code.replace('-', '_'), code.replace('-r', '_')):
-            if newcode in data.LOCALE_ALIASES:
-                newcode = data.LOCALE_ALIASES[newcode]
-                ret = self.try_get(code=newcode)
-                if ret is not None:
-                    return ret
+        ret = self.aliases_get(code)
+        if ret is not None:
+            return ret
 
         # Parse the string
         lang, country = self.parse_lang_country(code)