Translations, Last Update : 11.03.2020 Sadly WordPress don’t manage fallback correctly : it’s not possible to create a “fr” file for “fr_FR” and “fr_BE”. For now we have to duplicate all file for each language_culture. -> fr_FR, should be copied to : fr_BE fr_CA -> de_DE, should be copied to : de_CH_informal de_CH de_DE_formal -> es_ES, should be copied to : es_AR es_CL es_CO es_GT es_MX es_PE es_VE -> nl_NL, should be copied to : nl_BE nl_NL_formal fa (Persian) only don't exist copy to -> fa_ir fa_AF Local short code should be checked there : https://make.wordpress.org/polyglots/teams/