Improve newly added filters

The following discussion from !321 (merged) should be addressed:

• @hansegucker started a discussion: (+1 comment)

  Again: I think it was too early to merge this MR. It needs some extra work on frontend issues, also the filters that are used can be improved. Please give your opinions, @debdolph @nik.

  As it was a frontend issue, I think, I actually should had done a review on this before merging it.