Bukkit

Now minecraft can have fatigue, dehydration, radiation level.

Mechanism : Fatigue Dehydration Radiation

messages.yml : You can edit the message.yml for customized language and messages. Notice that if you use unicode character, say the color charaters code in minecraft. Those characters format is like \u000F.

If you've done editing your language version. Just replace messages.yml. You can edit them based on the tag of config. The config are quiet easy to understand. For example : YOU_CAN_DRINK_WATER_OR_POTION_TO_DECREASE_THRIST_LEVEL: "blablabla"