[ticket/12325] Automatic update should notify about outdated files

PHPBB3-12325
[ticket/12325] Fix: it's not stuck in an inifinite loop anymore

PHPBB3-12325
[ticket/12325] Don't use L_COLON

PHPBB3-12325
[ticket/12325] Fix: add a missing colon

PHPBB3-12325
[ticket/12325] Update coding style in template

PHPBB3-12325
[ticket/12325] Fix the language var name

PHPBB3-12325
[ticket/12716] Add the missing parameters in the call of clearToken

PHPBB3-12716
[ticket/12716] Add regression test

PHPBB3-12716
[ticket/12716] Use a string as session_id

PHPBB3-12716
[ticket/12771] Bug in profilefield_base_migration when used in ext

The base migration class should create lang entry for the new CPF
but it is supposed to strip it of phpbb_ prefix. As extensions
CPFs do not use phpbb_ prefix it will not create a lang entry.
This is as simple solution as it can be done.

PHPBB3-12771
[ticket/12772] Remove config_text parameter from message.form.topic

Broke Email topic since the topic_form class doesn't require this to be passed

PHPBB3-12772
[ticket/12771] Change var name

Change var name

PHPBB3-12771
[ticket/12764] Properly handle errors upon connecting to MySQLi database

As the db_connect_id gets set up by mysql_init(), the db_connect_id will be an
object with empty settings instead of just empty. Even if mysql_real_connect()
encounters an error upon connecting, the db_connect_id is still set. This
will result in trying to just access the database which obviously does
nothing.
By setting db_connect_id to an empty string, the script will not try to query
th database and properly handle any errors that occur upon connecting.

PHPBB3-12764
[ticket/12771] Shanging substr to strpos

Logical change ...

PHPBB3-12771
[ticket/12773] Fix language variable name in cli extension enable command

PHPBB3-12773
[ticket/12196] Revert Fix typo "referer" in acp/attachments

This reverts commit 9bc1f7924d5ef00fb988b81347d4c5c730b25eb2.
https://tracker.phpbb.com/browse/PHPBB3-12196

PHPBB3-12196
Merge pull request #2662 from dhruvgoel92/ticket/12196

[ticket/12196] Revert Fix typo "referer" in acp/attachments

* dhruvgoel92/ticket/12196:
  [ticket/12196] Revert Fix typo "referer" in acp/attachments
Merge branch 'develop-olympus' into develop-ascraeus

* develop-olympus:
  [ticket/12196] Revert Fix typo "referer" in acp/attachments
[ticket/12196] Fix typo in "referrer"

Referer is a typo in the HTTP RFC and should not be used in the UI

PHPBB3-12196
Merge pull request #2661 from n-aleha/ticket/12773

[ticket/12773] Fix language variable name in cli extension enable command

* n-aleha/ticket/12773:
  [ticket/12773] Fix language variable name in cli extension enable command