I would mention your situation in an addendum. This is similar to how adcomms look at W's. Isolated incidents don't really matter, but when there's a pattern, it raises a red flag. Taking a bunch of Spanish classes pass/fail looks suspicious. So I would write an addendum explaining your situation, which is not what adcomms are looking to avoid, but might appear to be that.
+!. I took sixteen credits of language pass/fail because that's how the class was offered - there was no option to have it graded, even if I would have wanted to (and I wouldn't have ). I imagine I'll just tell my schools that in an addendum and let it be.