add support for column default_written_communication_language to be included in the subject list as visible column #511

instructions how to release debian package

See merge request !424

Resolve "allow automatic daily export of subjects/appointments"

Closes #506

See merge request !423

Resolve "allow to export subject languages"

Closes #507

See merge request !422

make sure that type is not null

See merge request !421

Merge branch '503-click-on-generate-mail-for-available-multilingual-voucher-template-occurs-in-internal-error' into 'master'

Resolve "click on "Generate Mail" for available multilingual voucher template occurs  in internal error"

Closes #503

See merge request !420

/run/smasch is created by smasch.service in runtime so we cannot use it in command line

See merge request !419

Merge branch '501-adding-subject-while-screening-number-is-unable-throws-internet-server-error' into 'master'

Resolve "adding subject while screening number is unable throws Internet server error"

Closes #501

See merge request !414