Show correct naming for 1 comment (#25704) (#25712)

Backport #25704 by @earl-warren

- Resolves https://codeberg.org/forgejo/forgejo/issues/948

Co-authored-by: Earl Warren <109468362+earl-warren@users.noreply.github.com>
Co-authored-by: Gusted <postmaster@gusted.xyz>

options/locale/locale_en-US.ini

@@ -1430,6 +1430,7 @@ issues.next = Next
 issues.open_title = Open
 issues.closed_title = Closed
 issues.draft_title = Draft
+issues.num_comments_1 = %d comment
 issues.num_comments = %d comments
 issues.commented_at = `commented <a href="#%s">%s</a>`
 issues.delete_comment_confirm = Are you sure you want to delete this comment?