Doesn the range of languages supported in an LxC course depend upon the range of language skills of the course instructor?
No. Because (a) qualified and trusted Language Resource Specialists prepare and implement the LxC assignments and (b) instructors gauge what students have learned in LxC from work they do in English, LxC can in principle support any number of languages. In fact, it has in the past supported as many as eight different languages in a single course! In some cases, however, course instructors limit LxC to a specific language or languages of greatest relevance to the course subject matter.