Fixes bug 79506 "need to localize http auth prompt messages" r=gordon, sr=dougt

netwerk/resources/locale/en-US/necko.properties

@@ -42,5 +42,7 @@ ReadFrom=Read %1$S
 WroteTo=Wrote %1$S
 BeginFTPTransaction=Beginning FTP transaction
 EndFTPTransaction=Finished FTP transaction
-EnterUserPasswordFor=Enter username and password for %1$S
-EnterPasswordFor=Enter password for %1$S on %2$S
+EnterUserPasswordForRealm=Enter username and password for %1$S at %2$S
+EnterUserPasswordForProxy=Enter username and password for proxy at %1$S
+EnterUserPasswordFor=Enter username and password for %1$S
+EnterPasswordFor=Enter password for %1$S on %2$S