Use positive instead of negative logic for filters

Currently, the filter options have a negative description, i.e. the options describe what is filtered *out*, i.e. what I do *not* want to see. I think it is more intuitive and faster to grasp if you let the options correspond with what you *want* to see. If "done" is highlighted (orange color) I expect the done items to be displayed, not hidden. This is more like the search term which also describes what I *want* to see, not what I want to *filter out*.

Also, instead of "Fälligkeit > 7 Tage" you should say something like "Fälligkeit später als eine Woche" or something because words like "später/früher" are faster to grasp than mathematical operators "</>".