Merge branch 'unstable' into DA-406

* unstable:
  save "highlighted" challenges; when opening drallo details screen, update highlight state
  fixed missing placeholder for drallo-continue-message
  Inject GettextResourceManager instead of creating it (not everywhere yet)
  code cleanup
  added missing translations in german/english
  changed startup-project to android project
  mini-fix
  Auto-generated messages from challengeEnginge are now translated before adding the timeline-entry to the timeline
(android) skeleton methods
share through apps (include a link to text)
share link with challenge ID
Merge branch 'DA-406' into unstable

* DA-406:
  share link with challenge ID
  share through apps (include a link to text)
  (android) skeleton methods