Feature: translation review and reuse

[rhoerr]

Two parts to this.

1. There should be a table that tracks translations based on source, hash, and target language, to prevent translating the same text repeatedly in different ways. When doing a translation, we can look it up by hash and use the existing value if there is one. This could save time and cost.
2. There should be an admin grid that lists out all those translated values and lets an admin review and make changes. Review could mean they have to be approved before they take effect, or their approved automatically but the admin can change or deny one and have it update across the site.

[rhoerr]

I submitted the same feedback for the catalog data generation module. Possibly this could be done for both at once. mage-os-lab/module-catalog-data-ai#28