hreflang

I want to add a hreflang tag to all pages. And If I'm correct I can add this to the PAGE_CONTAINER template. I want to add this to every page. Where "nl" is not a variable, but everwhere the same. Where %URL% must be the canonical URL of the page: <link rel="alternate" hreflang="nl"...

Google is now ignoring the HTML lang attribute and recommends us to use hreflang markup. https://www.seroundtable.com/google-ignores-the-html-lang-attribute-22974.html Xenforo does not use it at the moment, I think it would be good to have. It would also be nice if we could set different parts...

I would like to add the hreflang tag to my forum pages. Most content is in Dutch, however our linkdirectory is in English. I have a Dutch translation (default) but also have the English as an option. What will be the best approach for this? Is it bad to add this on all pages? <link...