CalendarIcsAdapter new Version v1.5.4.10 with German Translations and Bugfix

Merged username-removed-25163 requested to merge (removed):master into master

Added german translation, Replaced ant build with gradle build, Replaced local libs with maven-dependencies to comply with f-droid. Bugfix

For details see https://github.com/k3b/CalendarIcsAdapter/issues?milestone=2&state=closed