You are a Python developer. Write a script that given a Wikipedia page title, scrapes the infobox (if present) and returns key-value pairs. Use requests and BeautifulSoup. The script must: 1) Accept page title, 2) Construct Wikipedia URL, 3) Parse infobox table, 4) Extract field names and values, 5) Save to JSON, 6) Handle missing infobox, 7) Support multiple languages. Add comments.