Now, if the natural language has some influence on the semantics of the programming language, it might be useful enough. Doubt it, as most natural languages' grammar is way harder than either English or your average programming language. The only attempt that comes to mind right now would be Lingua::Romana::Perligata[1] and that's just an esolang layer.
Now, for political or philosophical reasons an artificial language might be considered. Like Esperanto or Lojban, but I haven't seen something like this, either (I'm not counting Klingon).
[1]: http://users.monash.edu/~damian/papers/HTML/Perligata.html