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:
- The modal was missing a title.
- If the modal was closed once it wasn't reopened on another failed saving
attemp unless the user has visit another page in between.
- Several arguments were passed to <BsModal> that weren't existing at all.
* Fixed some typos/stylistic issues with the english localisation strings
* typographically correct ellipsis
* typographically correct apostrophe
* typographically correct em dash
