[ticket/12908] Fix operator typo in increment.php

PHPBB3-12908
[ticket/12909] Use correct lang vars in cli extension enable

PHPBB3-12909
Merge pull request #2792 from n-aleha/ticket/12908

[ticket/12908] Fix operator typo in increment.php

* n-aleha/ticket/12908:
  [ticket/12908] Fix operator typo in increment.php
Merge pull request #2793 from n-aleha/ticket/12909

[ticket/12909] Use correct lang vars in cli extension enable

* n-aleha/ticket/12909:
  [ticket/12909] Use correct lang vars in cli extension enable
[ticket/12906] Add rel="help" to FAQ link

PHPBB3-12906
Merge pull request #2796 from bantu/ticket/12906

[ticket/12906] Add rel="help" to FAQ link

* bantu/ticket/12906:
  [ticket/12906] Add rel="help" to FAQ link