tpl/tplimpl: Improve locale value in opengraph.html

[jmooring]

hugo/tpl/tplimpl/embedded/templates/opengraph.html

Lines 15 to 17 in b1bf0bf

	{{- with or .Params.locale site.Language.LanguageCode site.Language.Lang }}
	<meta property="og:locale" content="{{ . }}">
	{{- end }}

Improvements:

1. With v0.112.0 and later, site.Language.LanguageCode falls back to site.Language.Lang, so the explicit fallback above is not required.
2. Contrary to RFC 5646, the opengraph protocol requires an underscore instead of a hyphen in the locale.

Proposed change:

{{- with or .Params.locale site.Language.LanguageCode }}
  <meta property="og:locale" content="{{ replace . `-` `_` }}">
{{- end }}

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.