diff --git a/backend/src/Squidex.Domain.Apps.Entities/Apps/AppDomainObject.cs b/backend/src/Squidex.Domain.Apps.Entities/Apps/AppDomainObject.cs
index 349669ba1..6f700b17e 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Apps/AppDomainObject.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Apps/AppDomainObject.cs
@@ -21,7 +21,6 @@ using Squidex.Infrastructure.EventSourcing;
 using Squidex.Infrastructure.Log;
 using Squidex.Infrastructure.Reflection;
 using Squidex.Infrastructure.States;
-using Squidex.Infrastructure.Translations;
 using Squidex.Shared.Users;
 
 namespace Squidex.Domain.Apps.Entities.Apps
diff --git a/backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/ReferencesFieldBuilder.cs b/backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/ReferencesFieldBuilder.cs
index 9b11fb5a5..f047a7ef3 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/ReferencesFieldBuilder.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/ReferencesFieldBuilder.cs
@@ -5,7 +5,6 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
-using System;
 using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Entities.Schemas.Commands;
 using Squidex.Infrastructure;
diff --git a/backend/src/Squidex.Domain.Apps.Entities/Assets/AssetDomainObject.cs b/backend/src/Squidex.Domain.Apps.Entities/Assets/AssetDomainObject.cs
index 451d69a6b..ad434c0b6 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Assets/AssetDomainObject.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Assets/AssetDomainObject.cs
@@ -20,7 +20,6 @@ using Squidex.Infrastructure.EventSourcing;
 using Squidex.Infrastructure.Log;
 using Squidex.Infrastructure.Reflection;
 using Squidex.Infrastructure.States;
-using Squidex.Infrastructure.Translations;
 
 namespace Squidex.Domain.Apps.Entities.Assets
 {
diff --git a/backend/src/Squidex.Domain.Apps.Entities/Assets/AssetFolderDomainObject.cs b/backend/src/Squidex.Domain.Apps.Entities/Assets/AssetFolderDomainObject.cs
index 77b5c08ea..2db6c6e01 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Assets/AssetFolderDomainObject.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Assets/AssetFolderDomainObject.cs
@@ -54,7 +54,6 @@ namespace Squidex.Domain.Apps.Entities.Assets
         public override Task<object?> ExecuteAsync(IAggregateCommand command)
         {
             VerifyNotDeleted();
-            VerifyCommand(command);
 
             switch (command)
             {
@@ -97,24 +96,6 @@ namespace Squidex.Domain.Apps.Entities.Assets
             }
         }
 
-        private void VerifyCommand(IAggregateCommand command)
-        {
-            switch (command)
-            {
-                case AssetFolderCommand assetFolderCommand:
-                    if (Version >= 0 && (
-                        !assetFolderCommand.AssetFolderId.Equals(Snapshot.Id) ||
-                        !assetFolderCommand.AppId.Equals(Snapshot.AppId)))
-                    {
-                        throw new InvalidOperationException();
-                    }
-
-                    break;
-                default:
-                    throw new NotSupportedException();
-            }
-        }
-
         public void Create(CreateAssetFolder command)
         {
             RaiseEvent(SimpleMapper.Map(command, new AssetFolderCreated()));
diff --git a/backend/src/Squidex.Domain.Apps.Entities/Rules/RuleDomainObject.cs b/backend/src/Squidex.Domain.Apps.Entities/Rules/RuleDomainObject.cs
index 46029aaa2..4707495d3 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Rules/RuleDomainObject.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Rules/RuleDomainObject.cs
@@ -18,7 +18,6 @@ using Squidex.Infrastructure.EventSourcing;
 using Squidex.Infrastructure.Log;
 using Squidex.Infrastructure.Reflection;
 using Squidex.Infrastructure.States;
-using Squidex.Infrastructure.Translations;
 
 namespace Squidex.Domain.Apps.Entities.Rules
 {
diff --git a/backend/src/Squidex.Domain.Apps.Entities/Schemas/SchemaDomainObject.cs b/backend/src/Squidex.Domain.Apps.Entities/Schemas/SchemaDomainObject.cs
index baea40788..dbb58e00b 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Schemas/SchemaDomainObject.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Schemas/SchemaDomainObject.cs
@@ -21,7 +21,6 @@ using Squidex.Infrastructure.Log;
 using Squidex.Infrastructure.Orleans;
 using Squidex.Infrastructure.Reflection;
 using Squidex.Infrastructure.States;
-using Squidex.Infrastructure.Translations;
 
 namespace Squidex.Domain.Apps.Entities.Schemas
 {
diff --git a/backend/src/Squidex.Infrastructure/Translations/MissingKeys.cs b/backend/src/Squidex.Infrastructure/Translations/MissingKeys.cs
new file mode 100644
index 000000000..41d93657f
--- /dev/null
+++ b/backend/src/Squidex.Infrastructure/Translations/MissingKeys.cs
@@ -0,0 +1,44 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System.Collections.Generic;
+using System.IO;
+
+namespace Squidex.Infrastructure.Translations
+{
+    public sealed class MissingKeys
+    {
+        private const string MissingFileName = "__missing.txt";
+        private readonly object lockObject = new object();
+        private readonly HashSet<string> missingTranslations;
+
+        public MissingKeys()
+        {
+            if (File.Exists(MissingFileName))
+            {
+                var missing = File.ReadAllLines(MissingFileName);
+
+                missingTranslations = new HashSet<string>(missing);
+            }
+            else
+            {
+                missingTranslations = new HashSet<string>();
+            }
+        }
+
+        public void Log(string key)
+        {
+            lock (lockObject)
+            {
+                if (!missingTranslations.Add(key))
+                {
+                    File.AppendAllLines(MissingFileName, new string[] { key });
+                }
+            }
+        }
+    }
+}
diff --git a/backend/src/Squidex.Infrastructure/Translations/ResourcesLocalizer.cs b/backend/src/Squidex.Infrastructure/Translations/ResourcesLocalizer.cs
index 5b4d3c59a..26678662e 100644
--- a/backend/src/Squidex.Infrastructure/Translations/ResourcesLocalizer.cs
+++ b/backend/src/Squidex.Infrastructure/Translations/ResourcesLocalizer.cs
@@ -6,9 +6,7 @@
 // ==========================================================================
 
 using System;
-using System.Collections.Generic;
 using System.Globalization;
-using System.IO;
 using System.Resources;
 using System.Text;
 
@@ -16,29 +14,16 @@ namespace Squidex.Infrastructure.Translations
 {
     public sealed class ResourcesLocalizer : ILocalizer
     {
-        private const string MissingFileName = "__missing.txt";
-
-        private static readonly object LockObject = new object();
+#if DEBUG
+        private static readonly MissingKeys MissingKeys = new MissingKeys();
+#endif
         private readonly ResourceManager resourceManager;
-        private readonly HashSet<string> missingTranslations;
 
         public ResourcesLocalizer(ResourceManager resourceManager)
         {
             Guard.NotNull(resourceManager, nameof(resourceManager));
 
             this.resourceManager = resourceManager;
-#if DEBUG
-            if (File.Exists(MissingFileName))
-            {
-                var missing = File.ReadAllLines(MissingFileName);
-
-                missingTranslations = new HashSet<string>(missing);
-            }
-            else
-            {
-                missingTranslations = new HashSet<string>();
-            }
-#endif
         }
 
         public (string Result, bool Found) Get(CultureInfo culture, string key, string fallback, object? args = null)
@@ -166,13 +151,7 @@ namespace Squidex.Infrastructure.Translations
             if (translation == null)
             {
 #if DEBUG
-                lock (LockObject)
-                {
-                    if (!missingTranslations.Add(key))
-                    {
-                        File.AppendAllLines(MissingFileName, new string[] { key });
-                    }
-                }
+                MissingKeys.Log(key);
 #endif
             }
 
diff --git a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Assets/AssetCommandMiddlewareTests.cs b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Assets/AssetCommandMiddlewareTests.cs
index c27b44a1d..9b064e17e 100644
--- a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Assets/AssetCommandMiddlewareTests.cs
+++ b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Assets/AssetCommandMiddlewareTests.cs
@@ -7,7 +7,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 using FakeItEasy;
@@ -37,7 +36,6 @@ namespace Squidex.Domain.Apps.Entities.Assets
         private readonly IServiceProvider serviceProvider = A.Fake<IServiceProvider>();
         private readonly ITagService tagService = A.Fake<ITagService>();
         private readonly DomainId assetId = DomainId.NewGuid();
-        private readonly Stream stream = new MemoryStream();
         private readonly AssetDomainObjectGrain asset;
         private readonly AssetFile file;
         private readonly Context requestContext = Context.Anonymous();
@@ -281,7 +279,7 @@ namespace Squidex.Domain.Apps.Entities.Assets
 
         private Task ExecuteCreateAsync()
         {
-            var command = CreateCommand(new CreateAsset { AssetId = Id, File = file });
+            var command = CreateCommand(new CreateAsset { AssetId = assetId, File = file });
 
             return asset.ExecuteAsync(CommandRequest.Create(command));
         }