Merge branch 'develop'
Switch to the Transifex master release
Add `E_USER_DEPRECATED` to the list of error constants (see #5839)
Correctly adjust the accordion elements to the new DB structure (see #5820)
Support all known template types in the autoload creator (see #5857)
Preserve the CSS3PIE behavior file path when combining style sheets (see #5848)
Correctly bypass the cache if `bypassCache` is set (see #5872)
Fix the "module class %s" not found error message (see #5871)
Added support for old IE versions to swipe.js (see #5862)
Show the accordion headline in the back end preview (see #5890)
Add the `String::quoteMysqlRegexp()` method (fixes 5896)
Ignore the `auto_item` parameter when forwarding internally (see #5886)
Add the group name to single accordion elements (see #5814)
Support using commas in folder names in the file selector (see #5823)
Support FAQs with images on the FAQ page (see #5810)
Show the headline level in the back end preview (see #5858)
Correctly handle hidden pages in the custom navigation module (see #5832)
Show the headline level in the back end preview (see #5858)
Update ACE to version 1.1.01 (fixes #5852)
Revert the changes from bba0a64643c19610dfd896b5151b4aade49a95ca (see #5870)