Add/update newsletter messages in translation file

Author: arnoudhgz

app/code/Magento/Newsletter/i18n/en_US.csv

@@ -67,16 +67,16 @@ Subscribers,Subscribers
 "Something went wrong while saving this template.","Something went wrong while saving this template."
 "Newsletter Subscription","Newsletter Subscription"
 "Something went wrong while saving your subscription.","Something went wrong while saving your subscription."
-"We saved the subscription.","We saved the subscription."
-"We removed the subscription.","We removed the subscription."
+"We have saved your subscription.","We have saved your subscription."
+"We have removed your newsletter subscription.","We have removed your newsletter subscription."
 "Your subscription has been confirmed.","Your subscription has been confirmed."
 "This is an invalid subscription confirmation code.","This is an invalid subscription confirmation code."
 "This is an invalid subscription ID.","This is an invalid subscription ID."
 "This email address is already assigned to another user.","This email address is already assigned to another user."
 "Sorry, but the administrator denied subscription for guests. Please <a href=""%1"">register</a>.","Sorry, but the administrator denied subscription for guests. Please <a href=""%1"">register</a>."
 "Please enter a valid email address.","Please enter a valid email address."
 "This email address is already subscribed.","This email address is already subscribed."
-"The confirmation request has been sent.","The confirmation request has been sent."
+"A confirmation request has been sent.","A confirmation request has been sent."
 "Thank you for your subscription.","Thank you for your subscription."
 "There was a problem with the subscription: %1","There was a problem with the subscription: %1"
 "Something went wrong with the subscription.","Something went wrong with the subscription."
@@ -151,3 +151,4 @@ Unconfirmed,Unconfirmed
 Store,Store
 "Store View","Store View"
 "Newsletter Subscriptions","Newsletter Subscriptions"
+"We have updated your subscription.","We have updated your subscription."