String change: Eye of GNOME

["Lucas Rocha" <lucasr gnome org>]

Hi all,

I've just commited a patch which adds supports for XMP in Eye of
GNOME. This involved changing a tab name in image properties dialog
from "EXIF" to "Metadata". Also some more translatable metadata fields
were added: "Location", "Keywords", "Copyright", "Author" and
"Description".

I think that's all.

Cheers!

--lucasr