Fixes for more Welsh translations

[Iestyn Pryce <dylunio gmail com>]

Would it be possible for someone to commit the patch/po file attached to
the following bugs:

http://bugzilla.gnome.org/show_bug.cgi?id=589771
http://bugzilla.gnome.org/show_bug.cgi?id=589770


Thanks,
Iestyn

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