User profile settings: Rename Twitter to X

Problem

Now that Twitter has been re-branded to X, we should rename the field in the User Profile settings as well.

Screenshot_2023-10-17_at_14.42.42

Implementation guide

The icon should automatically update in the product as a result of gitlab-svgs#394 (closed), but we'll need to update the text manually.

  1. Update app/views/profiles/show.html.haml#L106 to X
Edited by Amelia Bauerly