[merge] Handle bad LANG

[John Arbash Meinel]

Right now if you set LANG to something unrecognized by python, you get
an ugly traceback.

The attached patch changes bzrlib so it falls back to just using 'ascii'
after emitting a semi-helpful warning.

I'm not 100% on the english of the warning, but I think it is reasonable.

This is probably small enough for 0.10, but I'll let Robert decide.

My only concern is that the test might be a little too brittle, because
it expects a specific formatting for the locale.Error.

John
=:->
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