Update i18n strings within product analytics

What does this MR do and why?

Moves i18n strings from external constants file into their respective components.

Updates tests to check for specific string values instead of matching the constant.

This is inline with our new frontend guidelines: Add documentation about not exporting translati... (!128012 - merged)

Screenshots or screen recordings

No visual changes.

How to set up and validate locally

No functional changes.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #421856 (closed)