Refactoring ahoy

refactoring of filenames and classnames into english.
Refactoring

Renamed fields, methods, contexts, and message passing names. Also hid
and closed activities that were no longer needed.
Cleaning

Making sure LaunchActivity goes away, so hitting back from mainscreen
means that the program exits instead of showing black screen.
Translated some comments and the menu resource names
Removed the title bars
Fixed style crashes
Started improving the event detail screen. Not yet done, so don't touch without warning me, for instance on trello.
Made menu options

but they still need activities to start.
Edited the EventDetail-screen
A primitive database is implemented
EventList draws list based on database.
Sending information from EventList to EventDetail
"Delete event" is now possible
Removed a bug in which the program crashed when all the events where deleted
Displays a toast if there are no messages left for the user when opening the eventList screen
Fixed the toast, so that it only displays when there are no more messages
Removed the use of raw strings as SQL-code
Added button on main menu, created acivity screens, made menu buttons go to next screen
Made the shift be pressed for the first letter by default when printing name, refactored a bit.
Made DatabaseHelper an interfact to the database.