Switch between english and japanese language in DLsite
This script will add a link at the top right in Dlsite that allows to toggle between English site or Japanese site.
After the English-Japanese site merge, this button now only switches between language, the button will say to which language it will toggle to. For example if you are in Japanese language, the button will show "Toggle Site (EN)", meaning it will toggle to English language.
It will not change the cookie that stores the default language, for that use the DLsite own button (top "Language" button)
