When generating new clean urls, transliteration of utf8 characters
works better when the locale is set appropriately, so it will be
useful to be able to change locales without having to change the
current language.

Change-Id: Ife9e65661dc582cb830a20c73cecd6942d28d62c
Signed-off-by: Richard Mansfield <richard.mansfield@catalyst.net.nz>