The languages that you are allowed to manage are reflected in both Content and Translation sections. See the Control User Group permissions on language variants documentation for details.
Improved read-only mode
When a user does not have permission to manage a given language, all Property Editors are shown in read-only mode when looking up that language. Read-only makes it possible to see but not edit content and has been updated to allow for copying. That’s right, you can now copy content that cannot be edited by highlighting text or using property actions such as copying all items from a Media Picker.
All built-in Property Editors in Umbraco now support read-only.
Read-only mode for Property Editors
Property Editors now have native support for the read-only mode. This can be used by package developers as well with a new configuration option for package manifest. This allows developers to implement support for the new read-only mode and provide the optimal editing experience. If read-only is not implemented, the behavior will be as before with an overlay that makes the content inaccessible. Documentation for this feature is in the works, for now the pull-request for the new features has details that should be helpful.
Editing shared properties across languages
With the introduction of user permissions for languages the behavior of properties that are shared between languages (invariant properties) has also been updated. Shared properties can now be edited and updated from any language, not just the default language.
We have introduced new culture/shared labels on properties to make it more clear where values come from. As it is now possible to edit an invariant value from any language the culture label has been updated to say the property is “Shared” instead of the previous “Inherited from…”