prepare for shift types model, add db update
add shift types model
prepare shift types controller and view
shift type list
add create shift type
add update, delete and view for shift type
better shift type links
integrate shift type into shifts
add basic shift view
link to next shift in menu
more infos in shift view
add basic shift view
rewrite create shifts for shifttypes
display shifts with title
add more icons for better shift view
fix different bugs with shift types
more fixes
update german translation
add import progress
fix update script for shifttypes