This is the 13941st most frequent German word.
fremdsprachige
"Fremdsprachige" means "foreign language" or "pertaining to a foreign language."
This sentence uses 'fremdsprachige' as an adjective describing the books, implying they are written in foreign languages.
Ich habe viele fremdsprachige Bücher in meiner Sammlung.
I have many foreign-language books in my collection.
Here, 'fremdsprachigen' is used to describe courses that focus on foreign languages.
In unserer Schule gibt es ein Angebot an fremdsprachigen Kursen.
In our school, there is an offer of foreign-language courses.
In this case, 'fremdsprachigen' describes a circle of friends who communicate in foreign languages.