I have a problem with the translation. The complete translation of the page works when the system mail are sent they sent the user in the selected language. If, however, from the admin area, a mail will be sent manually, it will be sent in the language of the Admin.

example
Admin - Language DE, EN language user = mail comes in DE
Admin - Language EN, DE language user = mail comes in EN

I have been asked to ask specific modules. But it seems to be directly a problem with drupal. One know the problem? Could it be already solved before?

http://drupal.stackexchange.com/questions/117949/email-delivery-will-onl...
https://www.drupal.org/node/2272307
https://www.drupal.org/node/2278831
https://www.drupal.org/node/2282899
http://www.drupalcommerce.org/questions/13854/change-custom-messagetype-...

I have been asked to ask specific modules. But it seems to be directly a problem with drupal. One know the problem? Could it be already solved before?

I am grateful for any tip