Depends on how they engineered the prompt.

Doing it directly with ChatGPT was pretty straight forward.

```

The following is a piece of JSON where the values are strings in the English language.

  {
    
    "title":"hello"
  
  }

Please translate the values into Spanish without altering the keys of the JSON object.

```

Responded with:

```

  {

    "title":"hola"

  }

```

EDIT: Looks like this is the prompt being used:

`Translate a i18n locale json content to ${targetLang}.`

Just my opinion, that prompt needs improvement.