By using our properties control in the 2011 build of SCORM Engine, you can just append the 'cc=' parameter to the querystring like this to see that language in the editor.
properties.aspx?package=1006&configuration=&doall=&showhome=&cc=ja-JP
The available languages in our 2011 version are:
cy-GB - Welsh
da-DK - Danish
de-DE - Deutsch
en-GB - English (United Kingdom)
en-US - Engish (United States)
fr-FR - French
it-IT - Italian
nl-NL - Dutch
pt-BR - Brazilian Portugese
fi-FL - Finnish
sv-SE - Swedish
ru-RU - Russian
ar-SA - Arabic (Saudi Arabia)
zh-CN - Chinese (Simplified)
zh-TW - Chinese (Taiwan)
ja-JP - Japanese