Add support for multiple languages

[potomak]

https://www.kooslooijesteijn.net/blog/multilingual-website-with-jekyll-collections

Example call to translate content:

curl https://api.openai.com/v1/chat/completions -v \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer TOKEN" \
  -d @translate_payload.json

translate_payload.json content:

  "model": "gpt-3.5-turbo",
  "messages": [
    {"role": "system", "content": "You're a professional translator from Italian to English."},
    {"role": "user", "content": "CONTENT"}
  ]
}