Support removing donation link / custom donation test

plugins/Sidebar/SidebarPlugin.py

@@ -409,6 +409,20 @@ class UiWebsocketPlugin(object):
             </li>
         """))
 
+        donate_key = site.content_manager.contents.get("content.json", {}).get("donate", True)
+        if donate_key == False or donate_key == "":
+            pass
+        elif (type(donate_key) == str or type(donate_key) == unicode) and len(donate_key) > 0:
+            escaped_donate_key = cgi.escape(donate_key, True)
+            body.append(_(u"""
+                <li>
+                 <label>{_[Donate]}</label><br>
+                 <div class='flex'>
+                 {escaped_donate_key}
+                 </div>
+                </li>
+            """))
+        else:
             site_address = self.site.address
             body.append(_(u"""
                 <li>