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This pull request adds comprehensive tests for the
to_html_langfilter, and improves language code handling and accessibility in the language selector. It has the nature of reinforcing #3718.Testing and filter correctness:
test/test_plugin_html_lang.rbto thoroughly test theJekyll::HtmlLangFilter#to_html_langmethod, ensuring correct conversion from Jekyll locale format (e.g.,zh_cn) to BCP 47 format (e.g.,zh-CN), proper handling of non-string inputs, and integration with Liquid templates. This test code was generated using RubyMine's Junie. This facilitates maintenance.Language selector accessibility and semantics:
_includes/language_selector.htmlto wrap language codes with<span lang="und-Latn">and<span lang="en">for English, improving accessibility and semantic correctness.