[#73363630]#73363630 improving time slots form
[#73363630]#73363630 add multiselect, switch button, make responsive design and change on controller side
[#73363630]#73363630 fix error of frozen string
[#73363630]#73363630 make the form responsive for new and edit of time_slot
[#73363630]#73363630 replace range slider by dropdown
simple fix to avoid exception when contact not loaded
fix spec to new behaviour of params