You can change the language in Ubuntu via the Settings:
However, this sometimes doesn't work very well
To make a permanent change you need to set the default locale
To do this, open a terminal window
Type in this command:
sudo dpkg-reconfigure locales
Then select your language e.g. en_GB.UTF (use the arrow keys to scroll up and down then press enter to select)
Then set this as the default language (use the arrow keys to scroll up and down then press enter to select)
Then it will install these locales:
Reboot the WRN for the changes to take effect