Review Mozilla 1954267: add localization to preview panel

🔍 Bugzilla Audit

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1954267

Description

This patch conflicts with BB 44045: Disable ML features on the 143 rebase.

It removes 77600 linkPreviewShift and linkPreviewShiftAlt from browser/components/preferences/main.js we need to verify this conflict resolution and see if there is anything else to be done.

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