Add test for edit question option tab and improvements

* added test for option tab
* improved subform (removed belongsto)
add optional message handling for assertArrayContainedIn
resolved merge (update subform answerdomain)
use assertTrue instead of old function arrayNestedElementPresent
Hacked translation/improved tests

* use dataprovider
* test now check with assertEquals
* cleaned data some more in tests
* save translation (label) as Translation