Do not override translation URL with language one

Fixes rb#203
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/views/changes.py

@@ -82,6 +82,7 @@ class ChangesView(ListView):
 
         if self.language is not None:
             url['lang'] = self.language.code
+            if 'changes_rss' not in context:
                 context['changes_rss'] = reverse(
                     'rss-language',
                     kwargs=url,