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language setting is used for encoding e-mail messages. valid languages are "japanese", "ja","english","en" and "uni" (utf-8). mb_send_mail() uses this setting to encode e-mail.
les langages valies sont: "japanese" (japonais), "ja "(japonais), "english" (anglais), "en "(anglais) and "uni" (utf-8). mb_send_mail() utilise cette option pour encoder les emails.