Translation API Config 

{
  "API key (if required)": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
  "Translation service": "microsoft"
}​

I made the Azure account and created the free translation.

Chat Translator config

{
  "Force default server language": false,
  "Log translated chat messages": false,
  "Show original and translation": true,
  "Translate message for sender": true
}​

Better Chat config

{
  "Maximal Titles": 3,
  "Maximal Characters Per Message": 128,
  "Reverse Title Order": false
}​

Errors I am getting

Failed to call hook 'OnBetterChat' on plugin 'ChatTranslator v2.2.0' (KeyNotFoundException: The given key was not present in the dictionary.)
  at System.Collections.Generic.Dictionary`2[System.String,System.Object].get_Item (System.String key) [0x00000] in <filename unknown>:0
  at Oxide.Plugins.ChatTranslator.OnBetterChat (System.Collections.Generic.Dictionary`2 data) [0x00000] in <filename unknown>:0
  at Oxide.Plugins.ChatTranslator.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00000] in <filename unknown>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00000] in <filename unknown>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x00000] in <filename unknown>:0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00000] in <filename unknown>:0
[Better Chat] [Owner] lineman2208: hola​