Lemenzo Gallery v1.17 — Localization & Ecosystem polish

Changes
- English remains the canonical/default locale in res/values/strings.xml.
- Added complete Danish (values-da), Swedish (values-sv), German (values-de), and Spanish (values-es) translations.
- Locale files mirror all 221 canonical string keys.
- Static validation now fails on missing/extra locale keys or formatting-placeholder mismatches.
- Premium About page now highlights Lemenzo Camera & Lemenzo Files integration.
- Lemenzo Vault wording now explicitly states extra security.
- Ecosystem copy explicitly names Lemenzo Camera, Lemenzo Files, and Lemenzo Vault.

Release gates
- Host tests must pass.
- Static validation must pass.
- All resource XML must parse.
- Locale key parity and Android formatting placeholders must match the English canonical resources.