Using the this.language JavaScript variable, you can dynamically load the Disqus embed in different languages on a per-page basis. For example, to load the embed in Russian:
var disqus_config = function () {
this.language = "ru";
};
For a full list of language codes, see Languages on Transifex. Note however that Disqus does not support all languages offered in Transifex. For a full list of supported languages, see the Disqus project on Transifex.
See https://help.disqus.com/customer/portal/articles/466249-multi-lingual-websites