Languages

language in config.yml: the file of lang/ the server speaks (en, es, or your own: copy one as lang/<code>.yml).
per-player-language: true: each player gets messages, bars, menus and event names in their Minecraft language when lang/ has it.
Event names, descriptions and boss names can be one text or one per language. Effect names are in effect-names of each lang file.
& codes, &#RRGGBB and MiniMessage work; a message set to "" is not sent.