The MHRA Style Guide Online
A Handbook for Authors and Editors • Third Edition
From Chapter 9, 'Quotations and Quotation Marks'
9.2 In Languages other than English
Quotations in languages other than English are usually treated in the same way as those in English (see 7.2). Unless there are special reasons to the contrary, the forms of quotation marks in foreign languages (« » „ “ etc.) should be normalized to English usage. In long quotations, a long (em) dash may be used to introduce direct speech in languages such as French and Russian. Spacing before and after punctuation should respect English-language norms.