fix default-expand-keys => default-expanded-keys

* Create ru_RU.js

* Rename ru_RU.js to ru-RU.js

Some CSS resets (including Bootstrap's) contain *::after{ box-sizing: border-box; }

This breaks the checkbox component style. Therefor add box-sizing: content-box explicitly to increase compatibility.

Update rlease sh

The full Dutch translations. I'm prepared to add future additional translations.