Improve content saving, label editing

CHDataManagement/Model/LocalizedPage.swift

@@ -6,9 +6,7 @@ import SwiftUI
  including the title, url path and required resources
 
  */
-final class LocalizedPage: ObservableObject {
-
-    unowned let content: Content
+final class LocalizedPage: ChangeObservingItem {
 
     /**
      The string to use when creating the url for the page.
@@ -50,13 +48,13 @@ final class LocalizedPage: ObservableObject {
          originalUrl: String? = nil,
          linkPreview: LinkPreview = .init(),
          hideTitle: Bool = false) {
-        self.content = content
         self.urlString = urlString
         self.title = title
         self.lastModified = lastModified
         self.originalUrl = originalUrl
         self.linkPreview = linkPreview
         self.hideTitle = hideTitle
+        super.init(content: content)
     }
     
     func isValid(urlComponent: String) -> Bool {