fix for missing lang="en" in some UI pages

[softhack007]

This PR adds the lang="en" attribute to all html pages where a language identifier was still missing.

Previously when opening the welcome page or update page, some smart browsers suggested to "translate from Danish".

Summary by CodeRabbit

• Style
  • Improved HTML standards compliance and accessibility by adding language attribute declarations to interface pages, enabling proper language detection for browsers and assistive technologies.

[coderabbitai]

Walkthrough

Added lang="en" language attribute to the root HTML element across eleven HTML files in the wled00/data directory. No functional, structural, or behavioral changes; purely semantic/accessibility enhancement.

Changes

Cohort / File(s)	Summary
HTML Language Attribute Enhancement wled00/data/*.htm, wled00/data/cpal/cpal.htm, wled00/data/icons-ui/demo.html, wled00/data/pixart/pixart.htm	Added lang="en" attribute to the root HTML element across all files for improved accessibility and semantic markup; no functional changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~4 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix for missing lang="en" in some UI pages' directly and clearly summarizes the primary change: adding the lang="en" attribute to HTML pages that lacked it.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ui_lang_en

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[DedeHai]

regarding UI (and merge conflicts) should I merge #5328?

[softhack007]

@DedeHai yes.
Please double-check if renaming "Server Description" is harmless, and then lets merge #5328 before this one.