Merge pull request #52 from khagaroth/stable

Updated Czech translation.
Czech translation: Use Czech quotes.
Update Chinese (Traditional) translation.
Correctly report the status of MO compilation.

Instead of always saying that it couldn't compile, tell the truth: it
could be not compiled at all, or compiled or failed to compile.
Increase version to 1.6.2, update NEWS.
Update French translation (incomplete).
Fix French plural forms expression.

The form used was incorrect: 0 should be the "one" category in French.