Localization: Added nl- translation for "step" property.
Localization: Added nl- translation for "step" property.

Closes #1902 
Arkni/jquery-validation,staabm/jquery-validation,staabm/jquery-validation,jzaefferer/jquery-validation,MeteorAdminz/jquery-validation,RobJohnston/jquery-validation,jzaefferer/jquery-validation,jzaefferer/jquery-validation,RobJohnston/jquery-validation,jquery-validation/jquery-validation,jquery-validation/jquery-validation,Arkni/jquery-validation,MeteorAdminz/jquery-validation