* Add Serbian language files.
Version 3.5.2 (2015-07-24)
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### Fixed
Revert some of the PhpStorm code inspector changes (see #7937).
Version 3.5.1 (2015-07-24)
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### Fixed
Add a `StringUtil` class to restore PHP 7 compatibility (see contao/core-bundle#309).
### Fixed
Fix the `Validator::isEmail()` method (see contao/core-bundle#313).
### Fixed
Strip tags before auto-generating aliases (see #7857).
### Fixed
Correctly encode the URLs in the popup file manager (see #7929).
### Fixed
Check for the comments module when compiling the news meta fields (see #7901).
### Fixed
Also sort the newsletter channels alphabetically in the front end (see #7864).
### Fixed
Disable responsive images in the back end preview (see #7875).
### Fixed
Overwrite the request string when generating news/event feeds (see #7756).
### Fixed
Store the static URLs with the cached file (see #7914).
### Fixed
Correctly check the subfolders in the `hasAccess()` method (see #7920).
### Fixed
Updated the countries list (see #7918).
### Fixed
Respect the `notSortable` flag in the parent (see #7902).
### Fixed
Round the maximum upload size to an integer value (see #7880).
### Fixed
Make the markup minification less aggressive (see #7734).
### Fixed
Filter the indices in `Database::getFieldNames()` (see #7869).
### Fixed
Back-ported two fixes from the upstream versions.
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