Since I implemented option to have custom language for each back office user. This option was also heritaged in widget/embed windows. This got users confusing, if I generated embed code for Russian why do I see english language? It was because the app remembered what language was set in back office. Since this small update, only site_admin will remember your language and you can easily test how widget in your language looks like without switching language in back office or using other browser.

If you desperately need this there is this github commit. 

https://github.com/remdex/livehelperchat/commit/81b4a3daab46e592933aab3b3f331b780669b03c