how to change mu language

Hello
I have a few questions, can anyone help me?
1> How to translate item option into another language.(What files need to be translated on the server and client).
2> How to custom a new item set into the game.
3>Can anyone share the tool edit season 18 cashshop?
4>How to create an event in season 18.
i am edit invasionmanager.xml but it doesn't work ((
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<InvasionInfo ID="11" RespawnMessage="17" DespawnMessage="-1" BossIndex="-1"...

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