Fixes for a couple of Welsh translation bugs

[Iestyn Pryce <dylunio gmail com>]

Could someone please commit the patch so the msgfmt check passes for
nautilus-media cy.po [1] and the po to update this Welsh translation of
pessulus [2].

Thanks,
Iestyn

[1] http://bugzilla.gnome.org/show_bug.cgi?id=589749 
[2] http://bugzilla.gnome.org/show_bug.cgi?id=589751

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