Clearly indicate when the project-version in the React editor is readonly, and when the user does not have translation permission for the selected language.

If a user is not able to edit translations, they should be easily able to tell that they cannot and why they cannot edit.

Technical note: this is the <TranslatingIndicator/> component, which is intended for this purpose. It can show "Translating" (with globe icon) or "Viewing" (with 'locked' icon), and give more detail in a tooltip about the reason that editing is locked.
For review, the same can show "reviewing" with the review eye icon.