If you want to create a multi-language OP2 site, then please try Transposh, a free localization WP plugin.
To integrate the translation bar to your OP2 page, please go to the Live Editor of the specific page >> Add Element >> Custom HTML/Shortcode element >> insert this code below:
Save when done. Go to the frontend and you'll see a dropdown to select the language of your choice. Just localize the texts at the frontend and update.