Hi I18n team, I just push my patch which changes horizon to generate the language list automatically [1] and the this topic is traced by the bug [2]. I would like to share my long-standing idea with the team. Does it sound reasonable? * The basic idea is to generate the language list based on message catalogs (PO files) availability. * Horizon now has four types of message catalogs (django, djangojs) in horizon and openstack_dashboard respectively. If all message catalogs are present, such languages are listed in the language list. There are some corner case logic. * Some languages share a same locale prefix. Good example is Spanish variants: es, es-ar, es-mx and es-ve. When horizon searches message catalogs for es-ar, a locale "es_AR" is first checked and then "es" (prefix) locale is checked. In this case, if "es-ar" has no corresponding translations ("es_AR") and "es" is already registered in the language list, "es-ar" will not be added in the language list. * For the source language (i.e., English), message catalog existence check is skipped. * The current setting LANGUAGES still has effect. Operators can use e used to limit the initial set of languages to exclude languages they want to show to their users. (Note that even when a language is specified in LANGUAGES setting, if not all message catalogs for the language exist the language will be skipped.) Thanks, Akihiro [1] https://review.openstack.org/#/c/450126/ [2] https://bugs.launchpad.net/horizon/+bug/1675298