Adds option to frontend choose wheelchair accesible trip
If trip supports Wheelchair and bike is shown in stop viewer

Currently:
- Red not allowed
- Green allowed
- Gray with ? Unknown
Icon is from icon font
Bike and Wheelchair trip capability are shown in trip Widget

TODO: Show this in print view
Moved bike/wheelchair CSS to own CSS file
Merge branch 'wheelchair' into slo_loc_timeformat_roads_arriva
Added translation for Wheelchair
Merge branch 'showWheelChairBike' into slo_loc_timeformat_roads_arriva