Add support for alternate localised pages

[gmarty]

That's a neat little widget you've got there! I use it a lot as it makes reading the meta tags easier than inspecting the source code manually.

It would be super useful to add support for alternate localised pages. They look like this in the markup:

<link rel="alternate" hreflang="en-gb" href="https://en-gb.example.com/page.html">
<link rel="alternate" hreflang="en-us" href="https://en-us.example.com/page.html">
<link rel="alternate" hreflang="en" href="https://en.example.com/page.html">
<link rel="alternate" hreflang="de" href="https://de.example.com/page.html">
<link rel="alternate" hreflang="x-default" href="https://www.example.com/">

[patrick91]

@gmarty I like it! do you want to make a PR for this? 😊