The English and French compliance-portal strings referred to "trust
center" in a few spots (back-navigation link, empty states) while the
rest of the app already calls this surface the "compliance portal".
Standardize on that term everywhere it appears in copy, and rename the
backing i18n key (backToTrustCenter -> backToCompliancePortal) to
match. Also fixes two spots where the French translation had left
"Compliance Portal" and "trust center" untranslated in English.
Signed-off-by: Bryan Frimin <bryan@probo.com>