Some JS load error in ja.wp.According to the information of the browser's developer kit and "debug=true",The error is "Uncaught ReferenceError: wgAjaxWatch is not defined." on line 912 of "bits.wikimedia.org/ja.wikipedia.org/load.php?debug=true&lang=fr&modules=site&only=scripts&skin=vector&*".
I make some test and it seem that this error is caused by the international interface settings.When I set the Internationalisation other language except "en"and"ja",the error will be thrown.And it seems that this error only happen on the main namespace page.
Although I can set the Internationalisation to "en" to make JS work successfully,I hoped that The Debugers can confirm this bug and fix it.

Version: unspecified
Severity: normal