You can uninstall or removes an installed gutenprint-locales package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,
$ sudo apt-get remove gutenprint-locales
If you would like to remove gutenprint-locales and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove gutenprint-locales
If you use with purge options to gutenprint-locales package all the configuration and dependent packages will be removed.
$ sudo apt-get purge gutenprint-locales
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove gutenprint-locales