Refine English translation

[JohnNiang]

What this PR does / why we need it?

This PR refines English translation of remaining parts.

Related to #7232.

Summary of your change

Mainly changes for frontend/src/lang/modules/en.ts.

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

None

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