add abort button to retry save modal and several other fixes for it #291
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Croodle shows a modal if saving a participation fails. The modal allows a user to retry the save attempt. While it was always possible to close the button by clicking on backdrop or using escape key, a button to do so was missing. A user may not know about the user ways and may see reloading
the page as only possibilty to close the modal if he doesn't want to retry again.
This adds the missing abort button and fixes some smaller bugs including:
<BsModal>
that weren't existing at all.