How to translate the calendar or planner
Midrub uses FullCalendar as calendar in apps. I'm sure i will release my own calendar, more advanced(and i have started to develop one) but until then, Midrub will use FullCalendar.
To translate the calendar in Midrub, just create the language key "calendar_language" in posts_user_lang.php or planner_user_lang.php with a url as value.
The url can be copied from here https://cdnjs.com/libraries/fullcalendar/3.9.0
Please use version 3.9.0. Copy the url with language you want and add in the language file.