Fix series templates minor issues
- Hide content group template report option for own templates
- Fix styling for tag deletion button in template management
- Provide dialog service in admin module
Open room creation when template add button has been clicked and user has no rooms:
Use template name for prefill of room name input.
Also introduce new navigateAfterCreation
flag in RoomCreateComponent
which is set to false here.
Closes #1246 (closed), #1226 (closed)