Must the entries in a list of sources match the language of their respective sources? For example, for a non-English text, may one include words and phrases such as "In", "volume", "edited by So-and-so and So-and-so", "translated by", pages xx-yy"?
Citations follow templates, e.g.,
A, B, & C (YYYY) Title. In BookTitle, volume X, pages xx-yy.
To cite a particular work, you fill-in the place holders, e.g., A, B, C, YYYY, Title, BookTitle, X, xx, and yy. Hence, words such as "In", "volume", and "pages" can remain in English.
When a template does not specify how to include translations of titles/booktitles, I think it is reasonable to include bracketed translations, e.g., original title (translated title).