DOP-4601: Unhide Japanese locale

[rayangler]

Stories/Links:

DOP-4601

Current Behavior:

• Japanese
• English
• Chinese
• Korean
• Portuguese

Staging Links:

All links were built without the GATSBY_FEATURE_SHOW_HIDDEN_LOCALES feature flag, to mimic prod.

• Japanese
• English
• Chinese
• Korean
• Portuguese

Notes:

• Japanese should now be present in consistent nav language dropdowns (top nav and footer)
• Users with a browser language set to Japanese (without previously selecting the English language) will now be redirected to the Japanese site.
• Small change to include hidden sites in locale validation. This is irrelevant now, but it would've been useful so that any locale-specific logic on a hidden site like ja-jp would've seen ja-jp as valid. If done previously, this would've helped prevent bugs where hreflang links on the Japanese docs site were showing ja-jp in the URLs, or showing the chatbot as an option.

README updates

• • This PR introduces changes that should be reflected in the README, and I have made those updates.
• • This PR does not introduce changes that should be reflected in the README

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[seungpark]

Interesting how noto-sans-sc and noto-sans-jp look almost identical!

[rayangler]

Interesting how noto-sans-sc and noto-sans-jp look almost identical!

Yup, they're pretty similar given that they're from a similar font family. I think the main difference is in whether a glyph/character is present in the font or not