Improve the quality of the Dutch translations
Improve the quality of the Dutch translations

This improves the quality of the Dutch translations.

- It fixes 2 or 3 outright errors.
- Uses consistent spelling throughout (eg. "email" vs. "e-mail", "unlock" vs.
  "ontgrendelen", etc).
- Uses actual Dutch words, rather than English or Dutchified English words (eg.
  "fouten" instead of "errors", "vergrendeld" instead of "geunlocked", etc).

nikolai-b/devise-i18n,mabras/devise-i18n,tigrish/devise-i18n,tigrish/devise-i18n,mhlopko/devise-i18n,jyrkij/devise-i18n,humancopy/devise-i18n