I want my calendar to display dates, etc. in French. How can I do that?
There is no native French translation of the calendar, but you can do so manually. In version starting with 1.7.3, go to:
/components/com_breezingforms/libraries/js/calendar/lang/
There you will see a file called "calendar-en-GB.js"Make a copy of that file and rename it to "calendar-fr-FR.js" -- then edit the translations there. Once you have done that, the calendar should be in French.