I heard of a few stories, I guy speaking a strange language is beleived to be crazy and is hospitalized, when all he was doing was speaking another language. I don't have a link for this one.
another story is almost lost but still in googles cache memory.
(Man)illegally held in the D.C. Jail for nearly two years after a court ordered him to be released from custody. During his unlawful imprisonment, the District never provided Mr. Heard with any communication assistance, even though he is deaf and unable to speak..performed medical testing on Mr. Heard and gave him potentially-dangerous anti-psychotic medications...
http://72.14.203.104/search?q=cache:RL02oZ0Zq5IJ:news.findlaw.com/scripts/printer_friendly.pl%3Fpage%3D/prnewswire/20050804/04aug20051354.html+Unlawfully+Detained+Man+Awarded+Over+%241.1+Million&hl=en&ct=clnk&cd=1&gl=ca
It is pure Kafka to illegally throw a man in jail on charges of nothing and then make it impossible for him to protest the illegality," Mr. Moustakas continued. "But that is precisely what the District of Columbia did for 670 days when it recklessly jailed Mr. Heard on false information, repeatedly failed through sloth and incompetence to recognize and correct its mistake, and refused to provide him with the federally-mandated sign language interpreter services and other communication assistance that would have allowed him to call attention to his wrongful imprisonment

I heard a story once (back around 1979 or 1980) of a woman who had been committed to a psych hospital and spent several decades there because a psychiatrist said she would only speak "gibberish". After her being locked up for something like 30 or 40 years, someone discovered that she was actually speaking some not widely understood foreign language (I think it may have been Hungarian). I recall a big headline in The Boston Globe - or maybe it was the other Boston paper - that said something like "After 40 Years, Her 'Gibberish' Becomes Clear".

There is another language some people may not know exists, but psychiatrists have named it "word salad". This happens to disoriented, confused, and (most likely over-medicated)patients in hospital settings.
Getting over that "language" barrier is not easy. Unless a patient has a loved one there to help decipher through bits and pieces of words and body language, this patient is never going to be discharged.
Anyone reading this in the psychiatric inpatient setting knows what I am talking about.
Anyone reading who uses the phrase "word salad" in front of a patient, and assumes they cannot hear or will remember what you talked about in front of them later...is WRONG.
It is not uncommon for patients to lose ability to communicate verbally, but they are still communicating, and they can still hear.
Communication can be heard in many forms, if the docs took the TIME to sort it out.