fix handling of legacy database.sql multicolumn keys in dca extractor
Merge branch 'hotfix/3.2.14' into support/3.2
Set the correct path to TCPDF in `system/config/tcpdf.php` (see #7264)
Correctly assign "col_first" and "col_last" in the image gallery (see #7250)
Fix the `Database::list_fields()` method (see #7277)
Updated the ACE editor to version 1.1.6 (see #7278)
Fix a bug currently occurring in Chrome 38 beta (see #7281)
Fix two issues with the ACE editor (see #7284)
Merge branch 'hotfix/3.2.15' into hotfix/3.3.6

Conflicts:
	assets/contao/js/core.js
	system/config/ace.php
	system/docs/CHANGELOG.md
	system/themes/default/main.css
Update the change log and the vendor libraries
Correctly mark CAPTCHA fields as mandatory (see #7283)
Fix the "link_target" insert tag
Always cache fallback language
Merge branch 'master' of https://github.com/backbone87/contao-core into hotfix/3.2.15
Fix a coding style issue
Download the translations during the build process
Fix bug in Theme.php - invoking loadDataContainer() after locking can break Theme import.
Fix the diff renderer output
Handle disabled modules in the module loader (see #7380)
Use an `.invisible` class which plays nicely with screen readers (see #7372)