[Geany-i18n] Translating colour scheme(s)

[Matthew Brush]

Hi,

I don't think colour scheme files[1] are translated yet. I was going to 
make a pull request to do it but I wasn't sure whether to use 
`POTFILES.in` and underscores as with `geany.desktop` file or whether to 
use the normal built-in localization provided by GKeyFile/desktop entry 
spec[2].

Any clues?

Cheers,
Matthew Brush

[1] Only `alt.conf` needs it so far, default scheme is hardcoded and is 
translatable already, if I understand correctly
[2] http://standards.freedesktop.org/desktop-entry-spec/latest/ar01s04.html