Japanese Locale (single user override)

I want to add japanese locale to use with wine.
From what I found I have to do, normally I would type in in terminal:
sudo gedit /var/lib/locales/supported.d/ja
and write following lines to the file:
ja_JP.UTF-8 UTF-8
ja_JP.EUC-JP EUC-JP
then I would type in terminal:
sudo dpkg-reconfigure locales
then run game with:
LANG=ja_JP.UTF-8 wine d:\\directory\\game.exe (how would I use it for other wineprefix?)
but I have no root access to do it, it says:
mackus is not in the sudoers file. This incident will be reported
Is there way to override global locales for one user only?

Moved to wine section.

Also interested in running wine in Japanese. The version I have (1.4.1) is compatible with UTAU, but I must install it under a Japanese locale first, before I can install the English GUI patch.

[Edit]
I managed to do what I needed by running

Code:

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LANG=ja_JP.utf8 wine utau0277inst.exe

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maybe this will do the trick for you.