Currently the assignees of a project/task only receive a notification if the step due date becomes changed in Task Options -> Change Due Dates.
It would be great if this option would also be available already on the project page when a language is selected and the due date becomes changed with the button Change Attributes. If a project has several languages, not all need to be selected. So also here it is possible to chenge the due date only for the languages where it it necessary.