diff --git a/.gitignore b/.gitignore
index 2db89d394e0..e82568c0a66 100644
--- a/.gitignore
+++ b/.gitignore
@@ -195,6 +195,7 @@ node_modules/
 
 wwwroot
 **/Localization/**/*.po
+!test/OrchardCore.Tests/Localization/**/*.po
 !src/OrchardCore.Modules/**/wwwroot
 !src/OrchardCore.Themes/**/wwwroot
 !src/OrchardCore.Modules/**/Localization/**/*.po
diff --git a/src/OrchardCore.Modules/OrchardCore.Localization/ModularPoFileLocationProvider.cs b/src/OrchardCore.Modules/OrchardCore.Localization/ModularPoFileLocationProvider.cs
index 4ba639c56bb..75fc3abdda3 100644
--- a/src/OrchardCore.Modules/OrchardCore.Localization/ModularPoFileLocationProvider.cs
+++ b/src/OrchardCore.Modules/OrchardCore.Localization/ModularPoFileLocationProvider.cs
@@ -74,6 +74,9 @@ public IEnumerable<IFileInfo> GetLocations(string cultureName)
 
             // \src\OrchardCore.Cms.Web\Localization\OrchardCore.Cms.Web-fr-CA.po
             yield return _fileProvider.GetFileInfo(PathExtensions.Combine(_resourcesContainer, extension.Id + CultureDelimiter + poFileName));
+
+            // \Localization\[CultureName]\[ModuleId].po
+            yield return new PhysicalFileInfo(new FileInfo(PathExtensions.Combine(_resourcesContainer, cultureName, extension.Id + PoFileExtension)));
         }
 
         // Load all .po files from a culture specific folder
diff --git a/test/OrchardCore.Tests/Localization/LocalizationManagerTests.cs b/test/OrchardCore.Tests/Localization/LocalizationManagerTests.cs
index bcd3aa1f005..83dfede050d 100644
--- a/test/OrchardCore.Tests/Localization/LocalizationManagerTests.cs
+++ b/test/OrchardCore.Tests/Localization/LocalizationManagerTests.cs
@@ -1,4 +1,9 @@
+using OrchardCore.Entities;
+using OrchardCore.Environment.Shell;
 using OrchardCore.Localization;
+using OrchardCore.Localization.Models;
+using OrchardCore.Settings;
+using OrchardCore.Tests.Apis.Context;
 
 namespace OrchardCore.Tests.Localization;
 
@@ -43,7 +48,7 @@ public void GetDictionaryReturnsDictionaryWithTranslationsFromProvider()
             .Setup(o => o.LoadTranslations(It.Is<string>(culture => culture == "cs"), It.IsAny<CultureDictionary>()))
             .Callback<string, CultureDictionary>((culture, dictioanry) => dictioanry.MergeTranslations(new[] { dictionaryRecord }));
 
-        var manager = new LocalizationManager(new[] { _pluralRuleProvider.Object }, new[] { _translationProvider.Object }, _memoryCache);
+        var manager = new LocalizationManager([_pluralRuleProvider.Object], [_translationProvider.Object], _memoryCache);
 
         var dictionary = manager.GetDictionary(CultureInfo.GetCultureInfo("cs"));
         var key = new CultureDictionaryRecordKey { MessageId = "ball" };
@@ -67,10 +72,56 @@ public void GetDictionarySelectsPluralRuleFromProviderWithHigherPriority()
             It.IsAny<CultureDictionary>())
         );
 
-        var manager = new LocalizationManager(new[] { _pluralRuleProvider.Object, highPriorityRuleProvider.Object }, new[] { _translationProvider.Object }, _memoryCache);
+        var manager = new LocalizationManager([_pluralRuleProvider.Object, highPriorityRuleProvider.Object], [_translationProvider.Object], _memoryCache);
 
         var dictionary = manager.GetDictionary(CultureInfo.GetCultureInfo("cs"));
 
         Assert.Equal(dictionary.PluralRule, csPluralRuleOverride);
     }
+
+    [Theory]
+    [InlineData("en", "Hello en !")]
+    [InlineData("zh-CN", "你好！")]
+    public async Task TestLocalizationRule(string culture, string expected)
+    {
+        var context = new SiteContext();
+        await context.InitializeAsync();
+
+        await context.UsingTenantScopeAsync(async scope =>
+        {
+            var shellFeaturesManager = scope.ServiceProvider.GetRequiredService<IShellFeaturesManager>();
+            var availableFeatures = await shellFeaturesManager.GetAvailableFeaturesAsync();
+            var featureIds = new string[] { "OrchardCore.Localization.ContentLanguageHeader", "OrchardCore.Localization" };
+            var features = availableFeatures.Where(feature => featureIds.Contains(feature.Id));
+
+            await shellFeaturesManager.EnableFeaturesAsync(features, true);
+
+            var siteService = scope.ServiceProvider.GetRequiredService<ISiteService>();
+            var siteSettings = await siteService.LoadSiteSettingsAsync();
+
+            siteSettings.Alter<LocalizationSettings>("LocalizationSettings", localizationSettings =>
+            {
+                localizationSettings.DefaultCulture = culture;
+                localizationSettings.SupportedCultures = [culture];
+            });
+
+            await siteService.UpdateSiteSettingsAsync(siteSettings);
+
+            var shellSettings = scope.ServiceProvider.GetRequiredService<ShellSettings>();
+            var shellHost = scope.ServiceProvider.GetRequiredService<IShellHost>();
+
+            await shellHost.ReleaseShellContextAsync(shellSettings);
+        });
+
+        await context.UsingTenantScopeAsync(scope =>
+        {
+            using var cultureScope = CultureScope.Create(culture, culture);
+            var localizer = scope.ServiceProvider.GetRequiredService<IStringLocalizer<LocalizationManagerTests>>();
+
+            // Assert
+            Assert.Equal(expected, localizer["hello!"]);
+
+            return Task.CompletedTask;
+        });
+    }
 }
diff --git a/test/OrchardCore.Tests/Localization/en/OrchardCore.Tests.po b/test/OrchardCore.Tests/Localization/en/OrchardCore.Tests.po
new file mode 100644
index 00000000000..7a17dd942c4
--- /dev/null
+++ b/test/OrchardCore.Tests/Localization/en/OrchardCore.Tests.po
@@ -0,0 +1,3 @@
+msgctxt "OrchardCore.Tests.Localization.LocalizationManagerTests"
+msgid "hello!"
+msgstr "Hello en !"
diff --git a/test/OrchardCore.Tests/Localization/zh-CN/OrchardCore.Tests.po b/test/OrchardCore.Tests/Localization/zh-CN/OrchardCore.Tests.po
new file mode 100644
index 00000000000..63865b3c7ae
--- /dev/null
+++ b/test/OrchardCore.Tests/Localization/zh-CN/OrchardCore.Tests.po
@@ -0,0 +1,3 @@
+msgctxt "OrchardCore.Tests.Localization.LocalizationManagerTests"
+msgid "hello!"
+msgstr "你好！"
diff --git a/test/OrchardCore.Tests/OrchardCore.Tests.csproj b/test/OrchardCore.Tests/OrchardCore.Tests.csproj
index 519888f4cba..e654abd7848 100644
--- a/test/OrchardCore.Tests/OrchardCore.Tests.csproj
+++ b/test/OrchardCore.Tests/OrchardCore.Tests.csproj
@@ -80,6 +80,12 @@
     <Service Include="{82a7f48d-3b50-4b1e-b82e-3ada8210c358}" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Update="Localization\*\OrchardCore.Tests.po">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
   <Import Project="..\..\src\OrchardCore.Build\OrchardCore.Commons.targets" />
 
 </Project>