Captcha's can sometimes be difficult to read. Especially on a mobile screen. The mobile site currently does not support refreshing captchas. Help new users to create accounts more easily by providing a JavaScript based captcha refresh button on the sign up form.

See this bug report for more information:
https://bugzilla.wikimedia.org/show_bug.cgi?id=51482

Students are required to read Wikimedia's general instructions first. Patches should be submitted to Gerrit and reference the bug report in the commit message. ideally the solution should be added to the beta mode of the MobileFrontend extension to allow testing and quicker merging, repository maintainers can help with this during the code review process.