hreflang support

[robrechtme]

Hi 👋🏻

Adding hreflang tags to your pages head improves SEO. I was reading this in the NextJS docs:

Next.js doesn't know about variants of a page so it's up to you to add the hreflang meta tags using next/head. You can learn more about hreflang in the Google Webmasters documentation.

When using next-i18next, every page will be available in all locales, so we could add the hreflang tags to appWithTranslation, no? If you're interested I can make a PR.

[isaachinman]

Due to limitations within NextJs, this is a pretty tricky issue and probably belongs more to a project like next-sitemap than next-i18next.

As they say themselves:

Next.js doesn't know about variants of a page

Feel free to elaborate on how you planned to solve this – let's definitely discuss in detail before any potential work begins.