minor changes to handle elements

Signed-off-by: Lehner Florian <dev@der-flo.net>
remove stuff without function

Signed-off-by: Lehner Florian <dev@der-flo.net>
add option to sort the contacts ascending and descending

Signed-off-by: Lehner Florian <dev@der-flo.net>
replace the label of buttons by its icon

Signed-off-by: Lehner Florian <dev@der-flo.net>