I've fixed issues with innerHTML calls in this release that would normally totally break things if there were changes to index.html. Now, if there is an error, it is handled more gracefully and usually just a single UI element breaks. You should be able to customize the index.html file now without too many hassles.
You will also notice that the index.html has the following line:
<script type="text/javascript" id="main-js" data-translation="blank" src="./main.js"></script>
you can specify different languages or different branding/wording translations by setting the data-translation value to that of the json filename located in the translations folder. You can also create your own json files and specify them that way. By default I am specifying the "blank" translation.
I'm trying to steer the app code in the direction of being a bit like a library, for numerous reasons, but please reach out if you have issues with this new release. This release has numerous bug fixes and uses a new handshake server to improve the group-room experience, which I will continue to update. I will continue to work towards allowing greater accessibility in stylizing the application.