SW-7231 - fix newsletter success message on unsubscribing in the account detail page
Merge pull request #915 in SW/shopware from bugfix/master/sw-7231-fix-newsletter-unsubscribe-message to master

* commit '86c4b19e70bb3b63a19927cd6c0cc595076602a7':
  SW-7231 - fix newsletter success message on unsubscribing in the account detail page