Correct small bug. Refactoring.
Change the color in DateActivity of the events selected as interesting.
Make the texts from the event selectable.
Add type and thema tags to the event. Implement extraction of tags in
Index and Goth Datum.
Fix bug with check of new events. Remove events from unselected group.
Download events from a selected group (preferences).
Fix problem with apostrophe when deleting from DB.
Fix the display of the date. Make the Toasts better.