The message MediaWiki:Recaptcha-createaccount
" To help protect against automated account creation, please type the two words you see in the box below: "
is both wrong, euphemistic, and misleading.
Users are not protected from SPAM or automated account creations,
when they enter two words, and the wiki isn't either;
entering two word only wastes users time, and creats some the likelyhood
for them having to re-enter their passwords an captchas serveral times.
The only protection is automats and SPAMbots not being able to
supply the two words, an assumption having some probability to itself,
and _this_ is what sould be communicated.