Bug fix + Improve menstruation feature

Now the menstruation feature is on the homescreen. This also means that you cannot change or fill in the menstruation fields (‘ongemak’ etc) for previous days. Suggestion to place this function one layer ‘deeper’ (to the screen of the workouts for that week), so that you can correct/fill the data for the days earlier that week. Also fix the bug that Join shutdown when clicking on ‘startdate of menstruation’ to change it.