fix: replace deprecated languageCode/.Site.LanguageCode with locale
Hugo v0.158.0 deprecated the languageCode config key and .Site.LanguageCode in favor of locale and .Site.Language.Locale. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012E2mmywuZyXmPBgSDtNdTL
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