Refactor i18n title matching to improve Chromium-based PiP compatibility

[BeardTech]

This PR refactors PiP window detection by moving from mostly hardcoded/translations-based checks to a JSON-driven matcher system, with broader internationalization
coverage for both Firefox and Chromium-based browsers.

It also consolidates and incorporates ideas/fixes that were previously proposed in other existing PRs, and adapts them into this new implementation.

What changed

• Reworked title matching in extension.js:
  • Added JSON-backed exact title matching.
  • Added title normalization (spaces, NBSP handling, trimming).
  • Kept static fallbacks and existing special-case handling.
• Added pip-title-matchers.json:
  • Structured with separate firefox and chrome nodes.
  • Includes many localized PiP titles.
• Replaced translate.sh with update_translations.sh:
  • Supports generating/updating matcher data from upstream translation sources.
  • Supports partial updates with:
    • --firefox-only
    • --chrome-only
• Updated packaging in bundle.sh to include pip-title-matchers.json.
• Updated README.md with the new translation/update workflow.