Fix two coding style issues
Return a boolean value in `Mysqli::set_database()` (see #6948)
Add a missing "aria-haspopup" attribute in the navigation template
Adjust the `build.xml` file
Handle the case that the child template and the parent template have the same name (see #6939)
Correctly add the WAI-ARIA attributes (see #6217)
Correctly wrap long labels in the tree view (see #6954)
Fix a typo in the cron script
Correctly overwrite the article template (see #6938)
Sort the templates in `Controller::getTemplateGroup()`
Update the example website (fixes #6957)
Try all locale variations when loading TinyMCE (see #6952)
Add an icon to the collapsible areas of the flexible theme (see #6958)
Add `cursor:pointer` to the DropZone uploader
Convert binary UUIDs in `DC_File` before saving (see #6893)
Catch Swift exceptions when sending form data via e-mail (see #6941)
Fix the file permissions of the DropBox files
Update the example website
Update the vendor libraries
Add more blocks to the main template "fe_page" (see #6934)