Given https://test.wikipedia.org/w/api.php?action=query&list=allusers&aufrom=Jimbo+Wales&aulimit=1 (<u userid="6295" name="Jimbo Wales" />), I created User:6295 on test.wikipedia.org (using an admin account, as a global blacklist rule prevents strictly numeric usernames...). I blocked the account with my main account (User:MZMcBride) and the post-block success screen, Special:Log/block, Special:BlockList, Special:RecentChanges, and the various log excerpts (at Special:Contributions, etc.) all look fine to me.

Special:Watchlist isn't showing the block of User:6295, but I think that's because the user did not yet have a user page (or possibly because the user account name was numeric...). This is a separate issue that I'll investigate elsewhere.

I made User:6295 an admin on test.wikipedia.org and self-blocked. When I visit https://test.wikipedia.org/w/index.php?title=Main_Page&action=edit while logged in as the self-blocked User:6295, I see:

You do not have permission to edit this page, for the following reason:
Your account or IP address has been blocked.

The block was made by Jimbo Wales. The reason given is testing.
Start of block: 04:06, 2 April 2013
Expiry of block: infinite
Intended blockee: 6295

You can contact Jimbo Wales or another administrator to discuss the block. You cannot use the 'e-mail this user' feature unless a valid e-mail address is specified in your account preferences and you have not been blocked from using it. Your current IP address is 68.33.116.129, and the block ID is #15060. Please include all above details in any queries you make.

Marking this bug as _confirmed_ (new) accordingly. (Hah! An April Fools' prank exposes a legitimate user interface bug.) Where the block message reads "Jimbo Wales", it should read "6295". I'm not sure how many MediaWiki messages are affected.

(In reply to comment #1)

Special:Watchlist isn't showing the block of User:6295, but I think that's
because the user did not yet have a user page (or possibly because the user
account name was numeric...). This is a separate issue that I'll investigate
elsewhere.

I filed this as bug 46769.

I'm marking this bug (bug 46768) as easy, as it should be a fairly trivial change.

gerrit 57436 should cover Title::getUserPermissionsErrors().

(In reply to comment #3)

Gerrit change #57436 should cover Title::getUserPermissionsErrors().

Reverted with https://gerrit.wikimedia.org/r/#/c/58283/ since the patch broke unit tests (see bug 47031)

Related URL: https://gerrit.wikimedia.org/r/58308 (Gerrit Change I49d973992a99e03b4e8de112b47b737037a85338)

Should be fixed in 1.22wmf3. Please file separate reports for any similar
issues that are not related to the "blockedtext" and "autoblockedtext"
messages.