[ticket/12858] Generate timezone selects with template loop

PHPBB3-12858
[ticket/12858] Use UTC for time info in footer and hide offset if it's 0

PHPBB3-12858
[ticket/12858] Remove hardcoded language entries from timezone selects

PHPBB3-12858
[ticket/12858] Fix timezone display on acp users page

PHPBB3-12858
[ticket/12858] Fix timezone select display in subsilver2

PHPBB3-12858
[ticket/12858] Rename tz_ prefixed block variables to timezone_ prefix

PHPBB3-12858
[ticket/12858] Directly return and use timezone selects

PHPBB3-12858
[ticket/13055] Add string profile fields validation options to support unicode

PHPBB3-13055
[ticket/13055] Add UTF-8 string tests for profile fields validation options

PHPBB3-13055
[ticket/12858] Properly format UTC offset in footer

PHPBB3-12858
[ticket/13094] Condition search properly

PHPBB3-13094
Merge pull request #2983 from Senky/ticket/13094

[ticket/13094] Remove the search box if there are no new posts to search for
Merge pull request #2954 from rxu/ticket/13055

[ticket/13055] Fix string profile fields validation to support unicode
Merge pull request #2844 from marc1706/ticket/12858

[ticket/12858] Remove hard-coded GMT from timezone drop-down and rename to UTC
[ticket/13087] Correctly link to user profile when contact field has no URL

Broken by 975c5655f0e9b65b7de3f2b832f1ef660a473832

PHPBB3-13087
Merge pull request #2993 from nickvergessen/ticket/13087

[ticket/13087] Correctly link to user profile when contact field has no URL
[ticket/13086] String replaces 50 with 20

PHPBB3-13086
Merge pull request #2994 from Skouat/ticket/13086-olympus

[ticket/13086] Update ACP_MASS_EMAIL_EXPLAIN language key

* Skouat/ticket/13086-olympus:
  [ticket/13086] String replaces 50 with 20
Merge branch 'develop-olympus' into develop-ascraeus

* develop-olympus:
  [ticket/13086] String replaces 50 with 20

Conflicts:
	phpBB/language/en/acp/email.php
[ticket/13105] Add a test for relative dates

PHPBB3-13105