feat(webapp): add filters for articles and events

Created by: Tirokk

🍰 Pullrequest

Add filters for articles and events.

Issues

• fixes #6190 (closed)
• fixes #6046 (closed)

Todo

In the newsfeed a user need more filter possibilities for:

• All
  • Question what are the filter possibilities for this?
    • events are sorted by creation date?
    • even ended events are shown?
• Articles
  • Filter possibilities as we have them now
  • Use masonary grid with rectangles for category filter
  • have an additional button with a remove X
• Events:
  • have an additional button with a remove X
  • on default don't show ended events
    • use eventStart_gte
    • what are ended events?
      • if there's no(!) end defined:
        • right after start date?
        • one hour after start date?
        • one day after start date?
      • if there's an(!) end defined:
        • right after end date?
  • optional:
    • can show ended events as well
    • seperate issue: sort by event date, see #6190 (closed)
• rename filter texts:
  • EN:
    • Post type → Content type
      • Events → Event
  • DE:
    • Beitrags-Typ → Inhaltstype
      • Veranstatungen → Veranstatung
• rename main filter button:
  • EN: Filter posts → Filter content
  • DE: Beiträge filtern → Inhalt filtern
• fix tests
• write tests
  • in general
  • for file webapp/components/FilterMenu/EventsByFilter.vue
• cleanup: search for Wolle

Have this from our meeting:

• Wenn Event ausgewählt ist
  • Start date ab jetzt (Default)
  • Search of already finished Events
  • Sorting ORDER BY „Start date“ ASC