Add BCP47 language picker in frontmatter #2720
Draft
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Using https://github.com/OM-MediaWorks/bcp47-picker, a pretty cool custom component BCP47 picker! I really like like the balance between input validation & canonlization (does not allow "english", only "en", and turns "en-gb" into "en-GB", etc) and inclusivity (if you want to write "dutch, as spoken in Chile, written in Arabic", you can).
Fix #2718
Waiting on OM-MediaWorks/bcp47-picker#11 and maybe some other issues that I opened there