added nav-tabs class to jem.css

it's used for the tabs within the editevent view. As we're using the
bootstrap tabs instead of the "old" tabs the class has been added.
adapted module files

- changed versionnr
- copied language strings
- added class to type="radio"
adapted plugin-mailer

- changed versionrnr
- added class to radio type
- changed creationDate
added check for task apply to function postSaveHook

added the check to the function as it's possible to press the save +
apply button in the front and we want to trigger the mail sending in
both cases.
altered editevent view

- replaced the "old" tabs by bootstrap