Merge branch 'hotfix/3.0.3'
Added the hotfix/3.0.4 branch
Added lazy template loading for newsletter mail templates
Handle `$_GET['auto_item']` when rebuilding URLs (also see e225fce79952faf9a09bb37e504941cea9b3aa00)
Merged the latest version 2.11 changes
Copy all content elements if pages are duplicated with childs (see #5241)
The table sorter did not work if jQuery and MooTools were active (see #5228)
Handle the case that `glob()` returns `false` (see #5226)
Added the missing `UserGroupModel` class (see #5218)
Show the "edit header" button even if it is disabled
Removed the "bodyclass" hook (see #241)
Added the Lithuanian translation source files
Added the Bulgarian translation source files
Added the Croatian translation source files
Updated all language files
Updated all language files
Fixed the `System::loadLanguageFile()` method (see #5259)
Prevent the auto_item feature from generating duplicate content (see #4012)
Fixed the `System::loadLanguageFile()` method (see #5259)
Fixed version 3.10.0 in the repository