[BUGFIX] Only insert language flag when the state is not active

See merge request !14

[TASK] Redo logic of adding hidden key description, change description

See merge request !12

text

[TASK] Make the languagevisibility table readonly if modify rights of the table are missing

See merge request !10

[BUGFIX] Fix error message when saving a new page via the edit view and changing languagevisibility settings

[TASK] Adjust the visibility settings so backend users with limited language access could still edit the visibility

[TASK] Add a languagevisibility constraint to extbase queries

See merge request !9