[ticket/12213] Add MCP events for custom quick moderation options

Addition to PR #2045 - rename the flag variable to more sensible one.

PHPBB3-12213
[ticket/12226] Split language strings to correctly allow multiple plural rules

PHPBB3-12226
[ticket/12227] "X from Y messages" should be "X out of Y messages"

PHPBB3-12227
[ticket/12216] Undefined index: lang_options when creating date profile field

PHPBB3-12216
[ticket/12233] Allow profile fields to be contact fields

Contact fields are displayed with in the contact section of the user profile
and are displayed differently in the mini profile next to posts and private
messages

PHPBB3-12233
[ticket/12233] Add images back to subsilver2

PHPBB3-12233
[ticket/12233] Update schema file

PHPBB3-12233
[ticket/12234] Replace ICQ with custom profile field

PHPBB3-12234
[ticket/11693] Change sql_build_array to support DELETE

PHPBB3-11693
[ticket/12243] Split custom_profile_fields.html into 1 file for each type

PHPBB3-12243
[ticket/12243] Remove outdated adm/style/custom_profile_fields.html

PHPBB3-12243
[ticket/12187] Add URL type for profile fields

PHPBB3-12187
[ticket/12187] Convert website field data to custom profile field

PHPBB3-12187
[ticket/12231] Add template events to forumlist_body.html

Add events before/after category header, before/after subforums list
to allow add/modify content in respective places.

PHPBB3-12231
[ticket/12187] Remove user_website functionality

PHPBB3-12187
[ticket/12245] Fix id attributes in acp_prune_users.html

The following labels had invalid id references:
1. joined (renamed to link to joined_after)
2. group_id (create teh id attribute on select box)

PHPBB3-12245
Merge pull request #2083 from hjpotter92/ticket/12245

[ticket/12245] Fix id attributes in acp_prune_users.html

* hjpotter92/ticket/12245:
  [ticket/12245] Fix id attributes in acp_prune_users.html
[ticket/12187] Remove user_website field

PHPBB3-12187
[ticket/12187] Split generate_profile_fields_template() into 2 methods

Removing the mode switch that wraps the content of the method

PHPBB3-12187
[ticket/12187] Do not make clickable when using as contact field

PHPBB3-12187