Allow client to send language values, that user cannot persist

[bergmania]

Description

Allows the client to send all content values for all languages when saving, even if the user do not have permissions to alter these.

The server ensures to rollback values the user do not have permission to alter.

This is a hack, but currently the only short-term solution to implement the language permissions feature in v14. Longer term, we should have a patch endpoint that can do the logic instead of the post endpoint.

Test

• Setup multiple languages
• Setup a user that do not have permissions to all languages
• Try to save the content for all languages (Not publish, as it requires client changes)
  • Verify only the content for the languages the user is allowed to change, is actually updated. (You will need to update the browser, to get the data again.)

[madsrasmussen]

I have tested the PR in the backoffice and it works as expected for saving. We have the same problem with publishing and scheduling too.

[bergmania]

@madsrasmussen, but for publishing I guess it make sense the client to not ask to publish those it is not allowed to?

[madsrasmussen]

@bergmania of course, good point. There is a client fix for publishing here: umbraco/Umbraco.CMS.Backoffice#2298