etc-gentoo/locale.gen

# /etc/locale.gen: list all of the locales you want to have on your system
#
# The format of each line:
# <locale> <charmap>
#
# Where <locale> is a locale located in /usr/share/i18n/locales/ and
# where <charmap> is a charmap located in /usr/share/i18n/charmaps/.
#
# All blank lines and lines starting with # are ignored.
#
# For the default list of supported combinations, see the file:
# /usr/share/i18n/SUPPORTED
#
# Whenever glibc is emerged, the locales listed here will be automatically
# rebuilt for you.  After updating this file, you can simply run `locale-gen`
# yourself instead of re-emerging glibc.

en_US ISO-8859-1
en_US.UTF-8 UTF-8
#ja_JP.EUC-JP EUC-JP
#ja_JP.UTF-8 UTF-8
#ja_JP EUC-JP
#en_HK ISO-8859-1
#en_PH ISO-8859-1
de_DE ISO-8859-1
de_DE@euro ISO-8859-15
de_DE.UTF-8 UTF-8
#es_MX ISO-8859-1
#fa_IR UTF-8
#fr_FR ISO-8859-1
#fr_FR@euro ISO-8859-15
#it_IT ISO-8859-1
#fr_FR.UTF-8 UTF-8
et_EE.UTF-8 UTF-8
#ru_RU.KOI8-R KOI8-R
#ru_RU.UTF-8 UTF-8
#ru_RU ISO-8859-5
#ru_UA.UTF-8 UTF-8
#ru_UA KOI8-U