How long will Discourse Translator with Google API take effect after enabled?

Here is the translator settings. My account language setting to English. Test account language setting to Chinese.

My account language setting to English.

Test account language setting to Chinese.

Test account create a topic with Chinese, but my account can’t find the translator icon.

Test Google translator API on Discourse server, and it works.

# export API_KEY=XXXXXXXXXXXXXXXXXXXXXXXXX
# TEXT="My%20name%20is%20Steve"
# curl "https://translation.googleapis.com/language/translate/v2?target=es&key=${API_KEY}&q=${TEXT}"
{
  "data": {
    "translations": [
      {
        "translatedText": "Mi nombre es Steve",
        "detectedSourceLanguage": "en"
      }
    ]
  }
}