[ticket/12325] Automatic update should notify about outdated files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/12099] Fix several issues in path_helper test

PHPBB3-12099
[ticket/12099] Clean some paths before using them

PHPBB3-12099
[ticket/12099] Correctly fix go back to root before prepending the root path

This allows moving app.php outside of phpBB and still work as expected

PHPBB3-12099
[ticket/12099] Clean paths in tests

PHPBB3-12099
[ticket/12099] Break clean_path tests with a simple test

PHPBB3-12099
[ticket/12099] Fix clean_path() ".." stripping when previous directory was "."

PHPBB3-12099
[ticket/12325] Fix the language var name

PHPBB3-12325
[ticket/12638] Use require if phpbb_require_updated isn't available

PHPBB3-12638
[ticket/12646] Add data-f attribute to breadcrumb links

PHPBB3-12646
[ticket/12646] Changed index/home data attr & updated subsilver

PHPBB3-12646
[ticket/12099] Deduplicate path generation

PHPBB3-12099
[ticket/12099] Prepend ./ to path to fix assets

PHPBB3-12099
[ticket/11711] Inform user of unsupported characters while posting

PHPBB3-11711
[ticket/11711] Improve checks for unsupported characters and check subject

PHPBB3-11711
[ticket/11711] Reduce size of tests and also test topic titles

PHPBB3-11711