Merge remote-tracking branch 'nickvergessen/ticket/12196' into develop-olympus

# By Joas Schilling
# Via Joas Schilling
* nickvergessen/ticket/12196:
  [ticket/12196] Fix typo "referer" in acp/attachments
[ticket/12196] Revert "[ticket/12196] Fix typo "referer" in acp/attachments"

This reverts commit 9bc1f7924d5ef00fb988b81347d4c5c730b25eb2.

PHPBB3-12196
[ticket/12196] Fix typo in "referrer"

Referer is only a typo in the HTTP RFC. We should not use that in the UI.

PHPBB3-12196