Lazy load locales

[lukashass]

Closes #1345

index.js size reduction: 538.71 KiB -> 382.74 KiB

Also sets correct html lang attribute.

TODO

• check for alternatives for vite plugin to load supported locales Provide list of supported locales when lazy loading intlify/bundle-tools#205

[6543]

to test if key is right on linux via cli:

cat web/src/assets/locales/en.json | jq .repo.enable.success

if you get your value the key is right ;)

[lukashass]

I couldn't get lazy loading of dayjs and TimeAgo locales to work, so I would suggest to try that later.

[6543]

Thanks :)