Set LANG to ensure correct Unicode handling

We pre-set the LANG variable in the environment to ensure that the JVM, JRuby,
Java libraries, and all the other moving parts will correctly handle
Unicode input.

Without this you risk getting replacement characters (typically `?`)
substituted (correctly, of course) for the Unicode characters in any input,
thanks to Ruby fallback encoding handling.

Signed-off-by: Daniel Pittman <daniel@rimspace.net>