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";
};

ISO 639-1 two-letter code exceptions

Most languages can be set using their standard two-letter ISO 639-1 code (full list). Exceptions are:

• Chinese (Traditional) = zh_HANT
• German (Formal) = de_formal
• German (Informal) = de_inf
• Portuguese (Brazil) = pt_BR
• Portuguese (European) = pt_EU
• Serbian (Cyrillic) = sr_CYRL
• Serbian (Latin) = sr_LATIN
• Spanish (Argentina) = es_AR
• Spanish (Mexico) = es_MX
• Spanish (Spain) = es_ES
• Swedish = sv_SE