You can right click on an adventuron game in Chrome and select "translate to ????" and it should automatically translate to the selected language. I think this is a chrome only feature.
About selecting text, I'll see if I can add a toggle to allow that. Being able to select text didn't play nice with mobile mode so that is why I disabled it originally.
Right-click in Firefox opens a shortcut menu (quite useful), but it is sometimes gets cropped, depending on where the mouse pointer is when you do the right-click.
Being able to copy and paste would be useful when doing reviews or sending bug reports on games.
