[ticket/11166] Use provided custom templates on AJAX confirm box

PHPBB3-11166
[ticket/11166] Fix typo in comment

PHPBB3-11166
[ticket/11166] Add caption to AJAX confirm box default template

PHPBB3-11166
[ticket/11166] Fix several custom confirm templates in prosilver

PHPBB3-11166
[ticket/11166] Add ajaxify support to normal ACP confirm_box()

Currently no custom template from the ACP uses AJAX support.

PHPBB3-11166
Merge branch 'develop' of https://github.com/phpbb/phpbb3 into ticket/11166

* 'develop' of https://github.com/phpbb/phpbb3: (799 commits)
  [ticket/11402] Fix undefined index in post/topic_in_queue
  [ticket/11400] If email is disabled, disable it for notifications
  [ticket/11398] Correctly call permission_set method in permission tool
  [ticket/11394] Relax Migration Tools
  [ticket/11386] Fix missing ;
  [ticket/10714] Get log from container in install, update and download/file
  [feature/avatars] Update module_auth of ucp module and fix small issues
  [ticket/11396] Rename insert_migration to set_migration_state
  [ticket/11395] Prevent acp_modules::get_modules_info from reincluding files
  [ticket/11393] Give more information on database updater
  [ticket/11386] Send list of migrations instead of using load_migrations
  [feature/avatars] Add migrations data file for avatars
  [feature/avatars] Reduce module auth of ucp avatar settings
  [ticket/10714] Use $phpbb_adm_relative_path instead of hardcoded adm/
  [ticket/10714] Logs are disabled for this page call only
  [ticket/6723] Show info that message has been deleted before delivery
  [ticket/11385] Fix issue with migration module tool not getting extension module info
  [ticket/11386] Fix failing tests from constructor changes
  [ticket/11386] Fix circular reference error & serialize error
  [ticket/11386] Remove tests that check if finder cache is working
  ...

Conflicts:
	phpBB/assets/javascript/core.js
Merge remote-tracking branch 'nickvergessen/ticket/11166' into develop

# By Joas Schilling
# Via Joas Schilling
* nickvergessen/ticket/11166:
  [ticket/11166] Add ajaxify support to normal ACP confirm_box()
  [ticket/11166] Fix several custom confirm templates in prosilver
  [ticket/11166] Add caption to AJAX confirm box default template
  [ticket/11166] Fix typo in comment
  [ticket/11166] Use provided custom templates on AJAX confirm box