Fix issue/comment menus

Closes https://codeberg.org/forgejo/forgejo/issues/1120

- Adds labels to reaction and context menu.
- Fixes taborder in markdown combobox buttons. They are now only one
  "tab" stop and can be navigated with arrow buttons and in the right
order (previously, it would skip the table button).
- Generates more verbose output for the reactio selectors to provide
  content for users who cannot identify the meaning of these buttons
visually. Explicit aria-labels are now preferred over auto-generated
ones.

options/locale/locale_en-US.ini

@@ -1634,6 +1634,12 @@ issues.num_reviews_one = %d review
 issues.num_reviews_few = %d reviews
 issues.commented_at = `commented <a href="#%s">%s</a>`
 issues.delete_comment_confirm = Are you sure you want to delete this comment?
+issues.reaction.add = Add reaction
+issues.reaction.alt_few = %[1]s reacted %[2]s.
+issues.reaction.alt_many = %[1]s and %[2]d more reacted %[3]s.
+issues.reaction.alt_remove = Remove %[1]s reaction from comment.
+issues.reaction.alt_add = Add %[1]s reaction to comment.
+issues.context.menu = Comment menu
 issues.context.copy_link = Copy link
 issues.context.quote_reply = Quote reply
 issues.context.reference_issue = Reference in a new issue