Dont assume. To quote someone famous (but will leave him nameless, because it will lead to a red herring of a topic) “never assume, because when you assume you make an A*S out of U and ME”. There are many informational signs in spanish throughout Sullivan County, including South Fallsburg.
The answer to why the sign was printed in english and yiddish, according to a frum Yid who lives there all year is that the impression of the locals is that the “hasidics” are litterbugs. Right or wrong, is irrelevant right now. The fact is that is their impression and we should be making a better impression.