Being technically able to type the local script somehow is a prerequisite for participation in the wiki. Therefore it should be okay to have the captcha in local script. It won't impede those users familiar with the wiki's local language. But it will potentially impede foreign users. Therefore it would be useful to provide a drop-down menu that allows you to choose the script of the captcha. That way every user can choose the script that fits best.
Instead of captchas like "shipsneeds" we of course need words in the local language. It shouldn't be hard to do some statistical analysis of existing articles on the wiki and to collect a sample of common words of limited length that can be combined to form local captchas. (I guess the above-mentioned script drop-down should be a script/language combination drop-down then.)
Marcus Buck User:Slomox