feat(webapp): add tooltips to all menu icons

Created by: Tirokk

Pullrequest

Add tooltips to all menu icons.

Issues

• fixes #6184 (closed)

Todo

Tooltip text for all menus:

• language select:
  • EN: Choose language
  • DE: Sprache wählen
• notifications:
  • EN: My notifications
  • DE: Meine Benachrichtigungen
• invite friends:
  • EN: Invite friends
  • DE: Freunde einladen
• show groups:
  • EN: Show groups
  • DE: Gruppen anzeigen
• show map: (perfekt already)
  • EN: Show map
  • DE: Landkarte anzeigen
• my profile:
  • EN: My profile
  • DE: Mein Profil
• check for mobile