Bug#900421: improve "wiki account creation delayed" message

On Sun, Jan 20, 2019 at 04:22:41PM -0800, Tassia Camoes Araujo wrote:
>Hi folks,
>
>I would add to the issue the portion of the message that says "from some
>people". When we got that yesterday creating Josh's account (Josh in
>CC), we found it a bit weird (why from me? what is wrong about me?).
>
>So I suggest your clearly state that the anti-spam has blocked the
>account creation, so it clearly shows it is not personal, just computer
>rules (spammy heuristics as described by pabs on IRC).
>
>Thanks for taking care of it!

Updated to say

  "Automatic account creation disabled to stop spammers signing
   up. Please contact $admin_private and describe what you want to do in
   the wiki."

How does that sound?