chore(lingui): remove comments from po files

[IanKrieger]

Runs https://lingui.dev/ref/cli#extract-clean on po files

[github-actions]

[puLL-Merge] - brave/ads-ui@1271

Description

This PR removes several outdated or unused translations from the localization files (en.po, es.po, pt.po, and test.po). The changes are primarily deletions of old message strings that are no longer needed in the application.

Changes

Changes

1. src/locales/en.po, src/locales/es.po, src/locales/pt.po, src/locales/test.po:
   • Removed numerous outdated message strings, which were marked with #~ at the beginning of the line. These were likely old translations that are no longer used in the current version of the application.
   • The removed strings include various UI elements, descriptions, and labels that are no longer part of the active codebase.
   • No new translations were added in this change.

This cleanup of the localization files will help reduce the size of these files and remove potentially confusing outdated entries. It should make the localization process more manageable by focusing only on the currently used strings in the application.