[Trunk|Admin]: change classes of remove/add buttons: 'remove red_background_color red_color' --> 'remove uk-button-danger' 'add green_background_color green_color' --> 'add uk-button-primary'
[Trunk|Admin]: change classes of remove/add buttons:
'remove red_background_color red_color' --> 'remove uk-button-danger'
'add green_background_color green_color' --> 'add uk-button-primary'