Don't translate `Commit#change_type_title` now

app/models/commit.rb

-# coding: utf-8
 class Commit
   extend ActiveModel::Naming
 
@@ -292,7 +291,7 @@ class Commit
   end
 
   def change_type_title(user)
-    merged_merge_request?(user) ? s_('ChangeType|merge request') : s_('ChangeType|commit')
+    merged_merge_request?(user) ? 'merge request' : 'commit'
   end
 
   # Get the URI type of the given path