Update the Japanese launcher & tutorial to use translate style.
Document translate style.
It listing directories fails, treat it as if the directory was empty.
Ignore arguments passed into RevertableObject.__new__.

Some versions of Python ignore them, others do not. We ignore them
ourselves to be on the safe side.
Fix renpy.input documentation.

Fixes #296.
More error checking for projects directory.
Add the "translate <language> style <style>:" statement.

This is a localized equivalent of the style statement.
Bump version.