I18n some work for multilingual support

[boydkelly]

Hi. Awesome antora hugo theme. All the submitted pulls are tested on Coastsystems, where I have used your template and added my blog stuff too. (This was just in the last few days so I will send more pull requests if you wish)

Actually over the past 3 years I have gone through several types of asciidoctor/antora hugo combos.

1. A bulma blog site with antora doc styleheet for content only.
2. A bare hugo site styled with a single asciidoctor stylesheet (ok I cheated by adding a font and a few other things...) But an interesting challenge/concept. (But I got tired of the plain look)
3. Adding back bulma (for cards, tags and other formatting) and reverting back to a lot of Antora css
4. Ditching Bulma and using your amazingly awesome port!

As you can see here Coastsystems, I have made your template mostly multilingual, but there is still a fair amount of work (date formats; more absLanURL's; i18n, for example) As I use the site I can fix and contribute back if you wish. Right now I have the language selector on the navbar, but it would be really great to get it into and <antora-like) module selector.

I also have the docs section on my site in an Antora site as well. Just an fyi i have used hugo modules for the 'docs', and 'blog'. The 'docs', are pulled from the Antora docs repository as well. So the docs on those two previous links are synced.

I did try to install the antora-hugo-default-ui as a hugo module but it refused to download. I will get back to that.

Cheers!