Fix a problem with localiztion when substituted value is 0.  Make language menu choices be in the given language.  Allow better localization of Jax/Extensions in About box.  Only update langauge menu when a new language is actually loaded.  Shorten a number of French menu items to improve menu appearance.  Correct some problems with FontWarnings and v1.0-warning messages.  Move language menu to initial MathJax menu rather than a submenu.  Fix a problem with canceling selection of renderer not reseting the menu selection.