i18n: Russian locale does not fully propagate — partial EN strings remain after language switch

[UrusGalai]

Summary

When the UI language is switched to Russian (ru), localization is incomplete — parts of the interface (buttons, tooltips, menu items, modal labels) remain in English. The switch appears to toggle a language flag but doesn't re-render all translated surfaces.

Environment

• Version: main @ 1b6ea6c (2026-04-23)
• Deployment: local (WSL Ubuntu 24.04), web UI on :3000
• Browser: Chrome (desktop)

Reproduction

1. Open Settings → switch language to Russian
2. Observe UI — main labels translate, but scattered elements stay English (specific elements vary per view)
3. Reload — partial state persists

Expected

Complete translation of all visible strings when ru is selected, or a documented list of intentionally-untranslated technical terms.

Hypothesis

• Missing keys in ru translation bundle (some components fall back to EN silently)
• OR translations not wired into all components (hardcoded strings)
• OR i18n context not reaching certain subtrees (e.g. portals, modals rendered outside main tree)

Impact

Non-EN users get a broken bilingual UI. Low severity, high polish cost.