#18208 test deep nesting and add documentation

docs/en/framework/fundamentals/localization.md

@@ -91,6 +91,20 @@ A JSON localization file content is shown below:
 
 > ABP will ignore (skip) the JSON file if the `culture` section is missing.
 
+You may also use Nesting in your localization file
+
+````json
+{
+  "culture": "en",
+  "texts": {
+    "HelloWorld": "Hello World!",
+    "MyNestedTranslation": {
+        "SomeKey": "Some nested value"
+    }
+  }
+}
+````
+
 ### Default Resource
 
 `AbpLocalizationOptions.DefaultResourceType` can be set to a resource type, so it is used when the localization resource was not specified:

framework/test/Volo.Abp.Localization.Tests/Volo/Abp/Localization/AbpLocalization_Tests.cs

@@ -386,6 +386,7 @@ public class AbpLocalization_Tests : AbpIntegratedTest<AbpLocalizationTestModule
         {
             _localizer["MyNestedTranslation__SomeKey"].Value.ShouldBe("Some nested value");
             _localizer["MyNestedTranslation__SomeOtherKey"].Value.ShouldBe("Some other nested value");
+            _localizer["MyNestedTranslation__DeeplyNested__DeepKey"].Value.ShouldBe("A deeply nested value");
         }
     }
 }

framework/test/Volo.Abp.Localization.Tests/Volo/Abp/Localization/TestResources/SourceExt/en.json

@@ -4,7 +4,10 @@
     "SeeYou": "See you",
     "MyNestedTranslation": {
       "SomeKey": "Some nested value",
-      "SomeOtherKey": "Some other nested value"
+      "SomeOtherKey": "Some other nested value",
+      "DeeplyNested": {
+        "DeepKey": "A deeply nested value"
+      }
     }
   }
 }