LACs like the schools you mentioned do not admit directly into majors, unlike some major flagships and other research universities. German may be a little less common than Econ and Poli Sci, but it is a normal major that is not likely to be of unusual interest to admissions. Plus, LACs know that many kids change their major once they arrive on campus and discover all the other fields that were not part of their high school curriculum.
If your interest in German is connected to other ECs and interests, then it could be part of a “why x” school essay, if they have a particularly strong department or interdepartmental program that you are interested in. But alone, as a prospective major, not going to be a factor in admissions.