-Valid values for LOCALE are the locale names in the mutt(1) and gpg(1)
-po file names.
-In mutt-1.3.28 (and newer) these are:
-.I ca cs da de el eo es et fr gl hu id it ja ko lt nl pl pt_BR ru sk sv
-.IR "tr uk zh_CN zh_TW" .
-In mutt-1.4.1
-.I bg
-was added.
-In gnupg-1.2.5 (and newer) these are:
-.I be ca cs da de el eo es et fi fr gl hu id it ja nl pl pt pt_BR ro ru
-.IR "sk sv tr zh_CN zh_TW" .
-.sp