Many NLP algorithms, especially ML ones, are actually language agnostic because the input is either tokens or characters. The part that is language dependant is

Many NLP algorithms, especially ML ones, are actually language agnostic because the input is either tokens or characters. The part that is language dependant is tokenization, normalization, and stemming. That part can be difficult and if not done well can screw up the downstream algorithm. As with everything, there are exceptions.