Hello,
I have tested my internet connection using the website link you provided: The speed of my connection was 544kbps (between 400 kbps (3G) and 768kbps (Broadband)). I am located in mainland Europe.
I will not request a refund from Apple because I think your app *could* become very useful for any trips I need to make to Japan in future years. I appreciate you are working to resolve the Japanese language support issue, and I understand it will take time. In addition, thank-you for taking my complaint seriously, I appreciate this good customer service.
I look forward to the Japanese language-support update in the future.
Grey