[FIX] Behaviour of edit form when clearing/adding fields

- Re-enable previously disabled fields (Bistum)
- Clear hidden inputs
- Do not reset values of checkboxes and submit buttons
- Shortened KlosterController code a bit
- Translated edit form scripts to CoffeeScript
Merge pull request #70 from subugoe/editform

[FIX] Behaviour of edit form when clearing/adding fields