Localize date strings

[codehag]

We have date strings for the notes. These are currently in English and it will be a pain to update them manually all the time. We could use intl here but that would require running js (we limit how much js we use, it should really be used for enhancement and this is a readability issue). We could also automatically generate the correct date strings from the _data/stage3.yml file. Open to solutions here.

[chicoxyzzy]

If we will pre-generate date strings eventually, it will be awesome if we could also pre-generate syntax highlighting to remove downloading of highligh.js library

[septs]

new Date("iso 8601 string").toLocaleString()

[jasonwilliams]

I think now we’re on 11ty we can do this?