According to Justice Department guidelines federal and state courts that receive federal financial assistance only have to "take reasonable steps" to accommodate lingual needs:
> The Supreme Court has affirmed that the Title VI prohibition against national origin discrimination includes discrimination against [limited English proficient] individuals on the basis of language. This means that courts that receive federal assistance must take reasonable steps to ensure that limited English ability does not get in the way of a person’s ability to appear and communicate effectively in court.
(p. 3)
That being said, whether or not a case gets dismissed due to claimed lingual needs would be entirely dependent on the jurisdiction, making this question nearly impossible to give a definite answer to. One jurisdiction might see someone claiming they need Mandarin Chinese assistance for a parking ticket and decide it is not worth the effort to pursue, while another may not.