Issue 6231 - Add tests for translation string substitution

cms/sources.py

Index: cms/sources.py
===================================================================
--- a/cms/sources.py
+++ b/cms/sources.py
@@ -142,34 +142,33 @@
 
     def read_static(self, filename):
         return self.read_file(self.static_filename(filename), binary=True)[0]
 
     #
     # Locale helpers
     #
 
-    @classmethod
-    def locale_filename(cls, locale, page):
-        return cls.localizable_file_filename(locale, page + '.json')
+    def locale_filename(self, locale, page):
+        config = self.read_config()
+        try:
+            page = config.get('locale_overrides', page)
+        except ConfigParser.Error:
+            pass
+        return self.localizable_file_filename(locale, page + '.json')
 
     def list_locales(self):
         result = set()
         for filename in self.list_files('locales'):
             if '/' in filename:
                 locale, path = filename.split('/', 1)
                 result.add(locale)
         return result
 
     def has_locale(self, locale, page):
-        config = self.read_config()
-        try:
-            page = config.get('locale_overrides', page)
-        except ConfigParser.Error:
-            pass
         return self.has_file(self.locale_filename(locale, page))
 
     def read_locale(self, locale, page):
         default_locale = self.read_config().get('general', 'defaultlocale')
         result = collections.OrderedDict()
         if locale != default_locale:
             result.update(self.read_locale(default_locale, page))