Hi ManyQs,

avast.co.jp is the localised site for avast. It is an avast site. :wink:

I can get to the same site, by changing location settings on the avast website.

As for the UI changing language, it should be set to whatever setting that you chose when installing. There is some web content that will show in a language that is dependent on your location so that could explain a difference in language.

Scott