More stable localizer for tests.

backend/src/Squidex.Infrastructure/Translations/ResourcesLocalizer.cs

@@ -28,15 +28,26 @@ namespace Squidex.Infrastructure.Translations
 
             this.resourceManager = resourceManager;
 #if DEBUG
+            missingTranslations = new HashSet<string>();
+
+            for (var i = 0; i < 3; i++)
+            {
+                lock (LockObject)
+                {
+                    try
+                    {
                         if (File.Exists(MissingFileName))
                         {
                             var missing = File.ReadAllLines(MissingFileName);
 
                             missingTranslations = new HashSet<string>(missing);
                         }
-            else
+                    }
+                    catch (IOException)
                     {
-                missingTranslations = new HashSet<string>();
+                        continue;
+                    }
+                }
             }
 #endif
         }
@@ -171,13 +182,23 @@ namespace Squidex.Infrastructure.Translations
             if (translation == null)
             {
 #if DEBUG
+                for (var i = 0; i < 3; i++)
+                {
                     lock (LockObject)
+                    {
+                        try
                         {
                             if (!missingTranslations.Add(key))
                             {
                                 File.AppendAllLines(MissingFileName, new[] { key });
                             }
                         }
+                        catch (IOException)
+                        {
+                            continue;
+                        }
+                    }
+                }
 #endif
             }