Improve content saving, label editing

CHDataManagement/Model/LocalizedTag.swift

@@ -1,8 +1,6 @@
 import Foundation
 
-final class LocalizedTag: ObservableObject {
-
-    unowned let content: Content
+final class LocalizedTag: ChangeObservingItem {
 
     @Published
     var urlComponent: String
@@ -22,11 +20,11 @@ final class LocalizedTag: ObservableObject {
          name: String,
          linkPreview: LinkPreview = .init(),
          originalUrl: String? = nil) {
-        self.content = content
         self.urlComponent = urlComponent
         self.name = name
         self.linkPreview = linkPreview
         self.originalUrl = originalUrl
+        super.init(content: content)
     }
 
     func isValid(urlComponent: String) -> Bool {