[marinofaggiana]

Summary

• Add missing English strings so the affected screens display readable text instead of raw localization keys.
• Standardize localization keys on _snake_case_ and update their references in the app and extensions.
• Remove unused entries and duplicate definitions. Reuse shared keys where the labels have the same meaning.
• Bump the build number from 0 to 1.

Translation follow-up

Existing translations for renamed keys need to be mapped to their new names in Transifex.

Verification

• Verified that all 796 statically identified localization keys resolve in the English catalogs, including all seven plural keys.
• plutil -lint and git diff --check passed.
• Xcode build and tests are pending.

AI assistance was used to audit and update the localization keys.