Updates for App Suite 8.1, round #1

- Added Chat related topics
- OXUD-1018 Updates regarding changes in the 'Confirmation' dialogs
- OXUD-1020 Story OXUIB-1393 Missing settings for layout options in address book and tasks
- OXUD-1022 Terminology adaption for the Tasks App according to UI
- OXUD-1023 Updates for the contacts detail view and edit window
- OXUD-1024 Updates for the description of the Calendar views
- OXUD-1026 Update: Function 'Add storage account' has been moved from folder tree to New button
- OXUD-1027 Update: Check the topic 'Tastaturbedienung'