Move some table configuration into EVASS template, ethnicity options sel...

...ector, CSS fix, fix empty datatables again

The CRUD fix is incomplete - I'm a bit clueless how to fix it properly so a workaround must do for now. Need to ponder a little more. But currently still better  here than the one I submitted for trunk. 

I hope we can get this merged into trunk soon :) as it starts getting a bit laborious to fix issues in two repos rather than just having them merged upstream.