feat: add reply-to header in email notification (#6393)

* feat: add reply-to header to smtp messages

* fix: grpc reply_to_address min 0 and js var name

* fix: add missing translations

* fix merge and linting

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Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/notification/channels/smtp/config.go

@@ -1,10 +1,11 @@
 package smtp
 
 type Config struct {
-	SMTP     SMTP
-	Tls      bool
-	From     string
-	FromName string
+	SMTP           SMTP
+	Tls            bool
+	From           string
+	FromName       string
+	ReplyToAddress string
 }
 
 type SMTP struct {