[FEATURE] Introduce the path_segment field that allows to give proper URLs yourself, Also a lot of cleanup was done

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

This commit adds a limit to the language of the job into the department
select field. This way no departments can be selected, that are not the
same language as the job itself. It also adds a sorting to make the
list easier to read.

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.