Norwegian translation for email notifications (#2673)

* Create confirmation_instructions.no.html.erb

* Create confirmation_instructions.no.text.erb

* Create password_change.no.html.erb

* Create password_change.no.text.erb

* Create reset_password_instructions.no.html.erb

* Create reset_password_instructions.no.text.erb

* Translates html welcome email

* Translates welcome email

* Translates html password changed email

* Translates password changed email

* Translates html reset password email

* Translates reset password email

* Fixes typo in translation

* Fixes typo in translation