Website update

Beside the website's small updates, we added:

1. Development progress section, where you can check the projects that our development team is working on.
https://www.groestlcoin.org/development-progress/

2. Short description for endorsed wallets.
Just hover over the wallet's image and you'll see if that is a suitable wallet for you.
https://www.groestlcoin.org/desktop/
https://www.groestlcoin.org/mobile/
https://www.groestlcoin.org/web/

3. Translation for our Korean members.
https://www.groestlcoin.org/ko/