New string in libgweather

[Vincent Untz <vuntz gnome org>]

Hey,

We had a string "Unknown" that wasn't marked for translation in the
timezone selector. I made it translatable with a context, and this adds
a new string in libgweather.

Just saw not that there was already a "Unknown" string used somewhere
else without context. I think it's bad to reuse it (the result will be
wrong in french, eg -- "inconnu" vs "inconnue"). If you guys think it's
bad to add the new string, I can just re-use "Unknown" without context.

Cheers,

Vincent

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