[TASK] Take the no_search field into consideration when generating sitemaps to avoid jobs being shown twice

[TASK] Integrate Languages and Countries into the extension and remove static_info_table requirement

This commit adds a new field and a new record type, the department.
It comes as a replacement for the area text field and allows for
department records to be created. This also introduces a migration
wizard, that can create new departments out of the old area entries.