fix: sync locale keys with en.json

[euyua9]

Summary

• add the missing Missing required parameter entry to the Italian locale
• normalize the Indonesian OpenAI key prompt key to match the exact en.json message id

Testing

• python3 - <<'PY'
  import json
  from pathlib import Path
  en = json.loads(Path('src/locales/en.json').read_text())
  it = json.loads(Path('src/locales/it.json').read_text())
  id_ = json.loads(Path('src/locales/id.json').read_text())
  assert 'Missing required parameter' in it
  assert 'Please set your OpenAI API key via ai config set OPENAI_KEY=<your token>' in en
  assert 'Please set your OpenAI API key via ai config set OPENAI_KEY=<your token>' in id_
  assert 'Please set your OpenAI API key via ai config set OPENAI_KEY=' not in id_
  PY