Target: phpBB 3.3.x (and master / 4.0, which has the same template)
File:   phpBB/styles/prosilver/template/mcp_approve.html

Why
—
Moderators asked for a "Report to Stop Forum Spam" checkbox on the screen
shown when disapproving a post in the moderation queue, so a spam post can be
disapproved and its poster reported in one step:
https://www.phpbb.com/customise/db/extension/phpbb_3.1_stop_forum_spam/support/topic/250564

The PHP side already has what an extension needs: the confirm form posts back
to mcp_queue.php, and core.disapprove_posts_after (since 3.1.4-RC1) runs after
the posts are disapproved, where an extension can read its own field from the
request. What's missing is a template event inside the form, so an extension
can add a field next to the disapproval reason. mcp_approve.html currently has
no template events at all.

The template has two copies of the form: an AJAX one (the confirm pop-up) and
a full-page one. Both need an event, so an extension field works whichever
way the moderator gets there.

Proposed events
---------------
1. mcp_approve_ajax_reason_after
   In the S_AJAX_REQUEST branch, after the disapproval reason block
   (after the <!-- ENDIF --> that closes
   <!-- IF not S_APPROVE and not S_RESTORE and .reason -->), before
   <fieldset class="submit-buttons">.

2. mcp_approve_reason_after
   In the full-page branch, inside the first <fieldset>, after the same
   reason block and before the <dl> that shows {MESSAGE_TEXT}.

Placing them after the reason block's ENDIF (not inside it) lets extensions
add fields when approving as well as disapproving; an extension checks
S_APPROVE itself if it only wants one of them.

Suggested docs/events.md entries
--------------------------------
mcp_approve_ajax_reason_after
===

• Locations:
      + styles/prosilver/template/mcp_approve.html
• Since: 3.3.x
• Purpose: Add content after the disapproval reason in the AJAX approve/disapprove confirm box

mcp_approve_reason_after
===

• Locations:
      + styles/prosilver/template/mcp_approve.html
• Since: 3.3.x
• Purpose: Add content after the disapproval reason on the approve/disapprove confirm page

AJAX path
---------
The AJAX confirm pop-up sends its whole form: core.js posts
$('form', '#phpbb_confirm').serialize() along with the hidden fields, so a
field an extension adds through mcp_approve_ajax_reason_after reaches
core.disapprove_posts_after with no JavaScript changes.

Open question
-------------

• Whether phpBB prefers one event name used in both branches over two names.