OXUD-1272 Some updates for the Search instructions
OXUD-1274 Story OXUIB-2650 Sharing options of personal address book disabled
OXUD-1277 Additional information for email scheduled send
OXUD-1279 Enhancement: Make the main instructions easier to access

- OXUD-1270 Update the Guard docu due to the new settings pages

- OXUD-1260 Check the german docu for missing translations
- OXUD-1268 Check the docu for missing conformance attributes
- OXUD-1266 Check the docu of the new features

- OXUD-1231 Story OXUI-1306 As a user I can add categories to emails
- OXUD-1197 Story OXUI-1189 As a user I can schedule emails to be sent in the future
- OXUD-1265 Review and improve the linking of help topics

- OXUD-1261 Describe the undelete feature for permanently deleted emails

- fixed layout of the shortcut tables
- removed superfluous files

OXUD-1240 Story OXUI-1335 As a user I can use keyboard shortcuts in App Suite UI
OXUD-1255 Story OXUIB-2573 Inconsistent naming of iCal subscription feature
OXUD-1257 Story OXUI-689 Support Browser back/forward for basic App Suite navigation
OXUD-1260 Check the german docu for missing translations

- Browser button navigation
- Email schedule send

- OXUD-1250 Fixes & improvements due to OXUIB-2538
- OXUD-1251 Check & polish all instructions for deleting objects
- OXUD-1248 Check & update the inline help mapping
- OXUD-1252 Some minor fixes and improvements

- OXUD-1246 Enhancement: Update the html start page due to the new settings structure
- OXUD-1249 Enhancement: Hide more superfluous instruction sets when opening a modal dialog

Added link checker to check if help files are missing

See merge request frontend/user-guide!12

- OXUD-1236 Story: OXUI-558 Drag and drop support for ICS files

- OXUD-1241 Enhancement: Hide superfluous instructions when showing a help page, even more updates
- OXUD-1235 Update the German user docu regarding the latest UI translations

- OXUD-1241 Enhancement: Hide superfluous instructions when showing a help page, fixes and updates