Comment by freedomben

Yeah, js can be static or dynamic, so its not just whether it's js that matters. It's whether the content is added or modified after initial rendering that makes it dynamic.

Most js heavy pages retrieve data from APIs, and the static parts of the code is just layout and menus, which isn't the part that people care most about translating. Thus why GP said "added via Javascript later." The important part of that isn't the "Javascript" , it's the "later."