The MathJax class forces ltr direction on messages

Created by: amire80

As I look at http://devel.mathjax.org/testing/mathjax/MathJax-issue530/test/localization.html?locale=he , I see that all the error messages (yellow background, red text and border) are shown with direction: ltr in the CSS. User interface messages in right-to-left languages must have direction: rtl.

(W3C's best practices for bidirectional HTML suggest to use HTML dir="rtl" and not CSS direction: rtl. If this be fixed using the HTML dir, it is preferable, but that is secondary.)