Change of language in TDE

My recent bout of proselytising is bringing converts - and questions that I can't answer. I'll feed these out one at a time.

If the locale of Trinity is wrong, i.e. was not installed correctly in the first place - US instead of UK in the case in question - how can one put it right? Keyboard is easy, but there is a lot more wrong than Keyboard. Dates are unreadable, money wrong, paper default sizes wrong etc. At least numbers are, I think, right!! There are two desktops on the laptop in question, and I *think* that the other one is right and is set to UK.

Just for the record, and in case of doubt, living with it is not a realistic option!!

Thanks, Lisi