Docs/improve lang import and set

[ronald-urbina]

Improve docs for adding/setting lang support and include German option to examples.

---

Note

Low Risk
Mostly documentation/example updates with a small additive API (resolvedLang/getResolvedLanguage) that should not affect existing behavior but could surface edge cases if consumers start relying on the resolved value.

Overview
Improves internationalization guidance by documenting script load order, manual lang overrides on <media-controller>, and how to contribute new language files; also updates the language list and examples (including German).

Enhances the vanilla i18n example to auto-select a best-match language from navigator.language, switch via a dropdown UI, and display both the detected browser language and the controller’s active resolved language.

Adds getResolvedLanguage() to utils/i18n and exposes it as a resolvedLang getter on MediaController so apps can query which language is actually being used after fallback resolution.

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[codecov]

Codecov Report

❌ Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.55%. Comparing base (3ea80df) to head (47d2c6b).
⚠️ Report is 300 commits behind head on main.

Files with missing lines	Patch %	Lines
src/js/utils/i18n.ts	28.57%	5 Missing ⚠️
src/js/media-controller.ts	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1287      +/-   ##
==========================================
- Coverage   78.55%   73.55%   -5.00%     
==========================================
  Files          59       56       -3     
  Lines       11080    13884    +2804     
  Branches        0      783     +783     
==========================================
+ Hits         8704    10213    +1509     
- Misses       2376     3638    +1262     
- Partials        0       33      +33     

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Cursor Bugbot has reviewed your changes and found 2 potential issues.

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