Draft: Issue 7

1. In Changeset panel make changset-no. clickable.
   • added link to changeset number which leads to https://www.openstreetmap.org/changeset/{id}
2. In "Filter" Panel rechts: => "Filter", Titel ist abgeschnitten? Welcher ist aktiv (keiner, ,,,)? Wie kommt man beim Editieren wieder raus?
   • put edit, duplicate and delete button into new button menu, grouping the three buttons into one menu button and a popup menu.
3. Filter: Buttons um Filter anzuzeigen sortiert nach Erstellungsdatum, Titel, Autor (was passiert bei 30 Filter)?
   • sort by titel is implemented
   • sort by author/creation date? no author is saved nor a date
   • filters are scrollable if there are too many
4. In "Create/Edit Filter" dialog: Add possibility to import a WKT polygon
   • -
5. In "Create Filter" dialog: Date picker should not show "close" but "OK".
   • changed "close" to "OK"