Localization

[WolfGangS]

Once #15 has been arranged

I think a effort should be made to implement at least 1 other language

If not complete, at least enough so that it can be contributed to and act as a template for other languages.

Resources for investigating

https://starlight.astro.build/guides/i18n/

https://starlight.astro.build/guides/i18n/#translate-starlights-ui

https://www.i18next.com/translation-function/interpolation

https://www.i18next.com/translation-function/plurals

[Martin-Pitt]

I've been looking at using the astro docs as a basis: https://github.com/withastro/docs/tree/main/i18n-guides

Slightly tweaked by placing the content/nav into content/i18 though