Fix language name matching to be case insensitive

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

weblate/lang/models.py

@@ -122,7 +122,7 @@ class LanguageManager(models.Manager):
             return ret
 
         # Try using name
-        ret = self.try_get(name=code.lower())
+        ret = self.try_get(name__iexact=code.lower())
         if ret is not None:
             return ret
 

weblate/lang/tests.py

@@ -38,6 +38,12 @@ class LanguagesTest(TestCase):
             'ltr',
             '(n==1) ? 0 : (n>=2 && n<=4) ? 1 : 2',
         ),
+        (
+            'czech',
+            'cs',
+            'ltr',
+            '(n==1) ? 0 : (n>=2 && n<=4) ? 1 : 2',
+        ),
         (
             'cs_CZ@hantec',
             'cs_CZ@hantec',
@@ -165,7 +171,7 @@ class LanguagesTest(TestCase):
             self.assertEqual(
                 lang.code,
                 expected,
-                'Invalid code for %s' % original
+                'Invalid code for %s: %s' % (original, lang.code)
             )
             # Check direction
             self.assertEqual(