Resolve commit comments displayed on a merge request

- Added missing i18n strings
- Added changelog entry
- Fixed lint errors

changelogs/unreleased/53950-commit-comments-displayed-on-a-merge-request.yml

+---
+title: Display "commented" only for commit discussions on merge requests
+merge_request: 24427
+author:
+type: changed

locale/gitlab.pot

@@ -4294,6 +4294,9 @@ msgstr ""
 msgid "MergeRequests|View replaced file @ %{commitId}"
 msgstr ""
 
+msgid "MergeRequests|commented on commit "
+msgstr ""
+
 msgid "MergeRequests|started a discussion"
 msgstr ""
 

spec/features/merge_request/user_sees_discussions_spec.rb

@@ -91,7 +91,7 @@ describe 'Merge request > User sees discussions', :js do
 
     context 'a commit non-diff discussion' do
       let(:note) { create(:discussion_note_on_commit, project: project) }
-      
+
       it 'displays correct header' do
         page.within(find("#note_#{note.id}", match: :first)) do
           refresh # Trigger a refresh of notes.