The idea is simple. I have written before an idea that it would be good if the user could input their own translations of written text of english software. Similarly it should be possible that the user with his online account could store changes to webpages. So my idea is that for webpages like codecademy.com and similar. You could make your own translations of the text. These translations among many others could then be optionally made public. So others who don’t read English that well could follow the person and view his translated text on the webpage.
To sync the webpage text and the translation. I guess you need a version system. So when the webowner changes the text the version gets updated and translators get notified.