Two handy search filters and some neccessary fixes.
- Two filters have been added to the book browser: one for category and one for language. More search options are coming, this is merely a small improvement between larger updates
- Applause for comments on group pinboards will now be displayed and linked correctly on the dashboard
- A glitch has been fixed, which caused the issue that some elements of the user interface had to be clicked multiple times
- Applause tooltips under chapters should not get stuck anymore