1. Remove the ability to disable ad mref drop-down when it has less then
two elements.
2. Use or label instead of disabled button
Remove the mini css from the mref select buttons
1. Enhance style
2. Fix bug when one add-button is used the other are not working
properly.
3. Replace the add-button to the end of the statement.
4. Enhance the user filter labels (Adding brackets where its needed)
Merge branch 'master' of github.com:molgenis/molgenis into feature/simplified_filter_UX_2649
Fix dataexplorer bug
When less then two elements the xref mref don't show the drop down
select operator.
replace "" with ' where it is necessary
Merge pull request #1706 from jjettenn/feature/simplified_filter_UX_2649

Feature/simplified filter ux 2649