[Xfce-i18n] Welsh translations for Trunk

[Geraint Rowlands]

> Next time in order to ease the work of the committers, could you please name the file in
> the attachments in a way he can easily identify which translations it is?

Taken on board. Stupidly simple in retrospect, sorry.

> In the future use xfce-i18n at xfce.org as translation mailing list.
I'll update my files for the next time.

Thanks.