**As an administrator I want to change the block status for a blocked user from my mobile device, so that I can allow the user to continue editing.**
In the overflow menu on mobile web, users with the `block` user right see a 'Block user' button on user pages (T307341). If the user is blocked, this button still says 'Block user' and still navigates only to Special:Block. This means that while editors can change that user's block status, they cannot easily access Special:Unblock except through a small link on the block page.
We could contextually show a link to Special:Unblock with the text 'Unblock user', and change the 'Block user' text to 'Change block'.
**Design**
TODO
**Acceptance criteria**
- When a user who has the `block` user right visits a user page for a blocked user, the Overflow menu should have a 'Change block' item which links to Special:Block and a 'Unblock user' item which links to Special:Unblock.
- The 'Block user' list item should no longer be shown
- For users without the `block` user right, no block-related items should be shown in this menu
- For users with the `block` user right, on user pages for users who are not blocked, no change should take place in this menu