I got a totally lost today when trying to export the reponses of a multi language survey in a language other than the base language. (Base = Romanian, Other language = English).
Even if I choose English in the "display responses" dropdown I cannot switch to page 2 (>400 answers) without seeing the base language again. "Expot results to application" does not offer a language selection at all.
I manipulated the URL to show all responses on one page, then copy/paste to Excel as values.
https://URL/index.php/admin/responses/sa/browse/surveyid/12345/browselang/en/start/0/limit/500
... but far from ideal. This will not let me export the question codes etc.