Enhanced Backend has finally reached beta status.

In the last few weeks we have made numerous large and small improvements. The main goal was to stabilize and improve existing features. With this release, Enhanced Backend is now officially in beta status.

Changes:
- FEATURE Changes in the user settings are displayed immediately (except for a few features, like the improved icons).
- FEATURE Displays the icon for quick editing of the page title in page module only when the mouse is hovered over it
- FEATURE Enhanced language visualization for page module: make language column header sticky
- FIX icon colors in dropdown menues
- FIX content tree title if container has no name