Partitioning fix.

src/Squidex.Domain.Apps.Core/Partitioning.cs

@@ -41,5 +41,10 @@ namespace Squidex.Domain.Apps.Core
         {
             return Key.GetHashCode();
         }
+
+        public override string ToString()
+        {
+            return Key;
+        }
     }
 }

tests/Squidex.Domain.Apps.Core.Tests/PartitioningTests.cs

@@ -16,12 +16,14 @@ namespace Squidex.Domain.Apps.Core
         public void Should_provide_invariant_instance()
         {
             Assert.Equal("invariant", Partitioning.Invariant.Key);
+            Assert.Equal("invariant", Partitioning.Invariant.ToString());
         }
 
         [Fact]
         public void Should_provide_language_instance()
         {
             Assert.Equal("language", Partitioning.Language.Key);
+            Assert.Equal("language", Partitioning.Language.ToString());
         }
 
         [Fact]