Whether or not legal doctrines have been established on this matter anywhere, I cannot say, but it strikes me that the "commonsense" answer to this question is, "yes: the native tongue of a corporation is the language in which board meetings are normally conducted". Alternatively, you could require a corporation to be conversant in the official tongue(s) of the states in which they are incorporated. That wouldn't be a description of "native tongue", but it strikes me as a perfectly reasonable legal requirement for a corporation. It's probably a necessary condition for incorporation anyhow, given that all the paperwork will be written in the language(s) of the state.

Bearing on this case: can a corporation reasonably be expected to be conversant in any arbitrary language? No. Is English a reasonable common tongue in the circumstances? It seems the most reasonable option.