Add new methods to models and model collections
Disable certain `tl_page` operations in the modal dialog
Trigger an `E_USER_WARNING` for unknown insert tag flags (see #4717)
Always show 7 links in the versions pagination in the back end
Only show unknown insert tags and insert tag flags in debug mode
Add class "ce_accordion" to the accordion elements
Replace `$exec()` with `Browser.exec()`
Update all language files
Never try to sync the DB in the templates editor
Add class "ce_text" to single accordion elements
Provide a fallback for deprecated `codeMirror` references (see #5537)
Add a location field to the calendar module (see #1870)
Always show the image thumbnails in the "FileTree" widget (see #4358)
Move `System::reload()`, `System::redirect()` and `System::addToUrl()` to the `Controller` class (see #4698)
Override the page description if a certain article is requested (see #4742)
Make the display mode of the "FileTree" widget extendable (see #5090)
Pre-fill the "alt" and "caption" fields with the file meta data (see #5225)
Automatically save "FileTree" and "PageTree" widgets (see #5398)
Add the "refresh" insert tag flag (see #5523)