When I want to change something I must change it in every file. Ideally I should make the changes just in one file, unless the it's a change of a text.
Maybe we can use Poedit or something similar. The website is based on https://notabug.org/vaeringjar/Peers, as I can see. So we could use Pelican (as that repository does) and something like https://github.com/getpelican/pelican-plugins/tree/master/i18n_subsites.
If you like the idea, I can help you do that. If not, let's discuss friendly about the pros and cons.
Thank you my friend, We welcome for any help that make the project better and easy to use.