Comment - Reference in new issue (#14366)

* Implemented "Reference in new issue"

* Fixed menu style on "pulls/x/files" because "button" has a style.

* Added context menu for PR file comments.

* Use only a single modal for every comment.

* Use current repository as default. Added search filter.

* Added suggested changes.

* Fixed assignment.

Co-authored-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>

options/locale/locale_en-US.ini

@@ -1068,6 +1068,7 @@ issues.commented_at = `commented <a href="#%s">%s</a>`
 issues.delete_comment_confirm = Are you sure you want to delete this comment?
 issues.context.copy_link = Copy Link
 issues.context.quote_reply = Quote Reply
+issues.context.reference_issue = Reference in new issue
 issues.context.edit = Edit
 issues.context.delete = Delete
 issues.no_content = There is no content yet.
@@ -1225,6 +1226,7 @@ issues.review.resolve_conversation = Resolve conversation
 issues.review.un_resolve_conversation = Unresolve conversation
 issues.review.resolved_by = marked this conversation as resolved
 issues.assignee.error = Not all assignees was added due to an unexpected error.
+issues.reference_issue.body = Body
 
 pulls.desc = Enable pull requests and code reviews.
 pulls.new = New Pull Request