Update all language files
Sort the list of available modules (see #6391)
Bump the version number
Merge branch 'hotfix/3.1.5' into release/3.2.0
Open the style sheets link in the page layout module in a modal dialog (see #6406)
Trigger the `Backend.toggleCheckboxes()` function in `Theme.toggleSelect()` (see #6399)
Allow special characters in `Validator::isUrl()` (see #6402)
Update the example website