[agent] plage ouverture fixes : fix monthly recurrences + dedicated form pages
Created by: adipasquale
https://trello.com/c/ywpNNFsy/1003-creation-de-plage-ouverture-jour-de-debut-pas-pris-en-compte and https://trello.com/c/b08geApC/1011-creation-de-plage-douverture-la-barre-lat%C3%A9rale-se-ferme-lorsquon-cherche-une-date-de-fin-de-r%C3%A9currence
2 fixes :
- wrong date format in moment with new datepicker was causing misinterpretation of the dates => start date were messy with monthly recurrences
- navigating in datepicker was erroneously navigating away from form sidebar for some browsers in some situations. simple and rough solution : move away from sidebar forms to dedicated pages :)