Rephrase the "help protect the wiki" CAPTCHA requests

Of course entering a CAPTCHA does not help the wiki; asking it does.
This was already fixed in the main messaging but not in the secondary ones.

Bug: 38597
Change-Id: I126761d7e8d2f101cc5ae79397e44123a0e88ea5
Merge "Rephrase the "help protect the wiki" CAPTCHA requests"