[PoC] theme: add links to article translations

[paulignari]

This is a rude Proof of Concept of translation links near the article title only to see if this is a viable option.

The graphic choices may be subverted, maybe a line under the title looks better.

[Avamander]

Any updates on this? Also have you thought about adding the hreflang tag to the links for SEO purposes?

[mosra]

I will need something like this for my updated portfolio, but for the next month or so I have other, higher-prioriity tasks to do. Thanks for hreflang, noted, didn't know about it.