What is NetTranslate?
NetTranslate is a lightweight plugin that leverages the Google Translate API and your internet connection to translate any chat message in real time. Whenever a player sends a message, it will be passed through Google Translate and returned to all your players in their preferred language.
How does it work?
Minecraft allows you to select your language in its client settings. This language selection is detected by NetTranslate to find out what locale the player is typing in and what language they will receive in. When a player sends a chat message, it is converted from their locale to the locale of every other player.
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https://www.spigotmc.org/resources/nettranslate.41397/
versions: 1.8 to 1.12