"Piszemy książkę po angielsku."
Translation:We are writing a book in English.
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only in this context - speaking, writing in a language.
I checked a dictionary http://sjp.pwn.pl/szukaj/po.html po has 19 meanings,
Usually po means after popołudnie= afternoon
Prepositions do not change, so they do not have cases.
Words after preposition take different cases depending on preposition and context.
And here in "po ....u" it's not a real case, it's a special word form of adjective just for this kind of expressions.
I did write somewhere a list of possible meanings of po+ adjective, but it's basically- like we they do it there .
1062
The preposition "po" takes the locative (also the accusative, if it denotes a direction). Wiktionary has a long list of meanings of this preposition, and I just learned that "po angielsku " is not called locative but "historic dative" - a case that looks exactly like the locative (and not like today's dative polskiemu).