Fix English capitalization and clarify plural example in README

[rauldsl]

Description

This PR addresses minor documentation issues in the README.md:

• Corrects the capitalization of English in the translation example.
• Improves readability of the plural translation example by clearly separating singular and plural cases.

Checklist

• No secrets, sensitive information, or unrelated changes
• Lint checks passing (make lint)
• Generated assets in-sync (make validate-generated-assets)
• Go mod artifacts in-sync (make validate-modules)
• Test cases are added for new code paths

Testing

No functional changes.
Only documentation edits; tested by reviewing the README content.

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[rajathagasthya]

We can't change vendored files directly. You will need to make changes in the original repo.