German Umlaute fixed.
reverted bad language commit
really reverted changes
Merge commit '0d5f4a4dfaaf1f49e0c92a06e2ea4337d53bb9fa'

Conflicts:
	src/main/resources/org/projectforge/plugins/teamcal/TeamCalI18nResources_de.properties
UpdateTime renamed to UpdateInterval.
Merge commit 'fa4bf97b120a844b9bd484a6c9eedecfca8b764c'

Conflicts:
	src/main/resources/org/projectforge/plugins/teamcal/TeamCalI18nResources_de.properties