This is really easier and much more portable (Mac OS 10.5 and later)
than the other solution proposed. The problem with the actual code happens
when I set English as my main language with a French localisation and
keyboard. Sometimes, the AppleLanguages configuration file contains names
like "English" instead of "en", "EN" or "en_EN". Moreover, there can be
more than one language defined here. Instead, I suggest with this PR to
use AppleLocale directly, which is in the "en_EN" format (or whatever
language) and is set to the current language used by the machine. This
would allow users to just launch Zenmap and have the software launched in
the desired language without having to use the terminal (they can still
change their machine language in the System Preferences or via the
Terminal, but it would be easier to use).
