diff --git a/src/OrchardCore/OrchardCore.Localization.Core/PortableObject/PortableObjectStringLocalizer.cs b/src/OrchardCore/OrchardCore.Localization.Core/PortableObject/PortableObjectStringLocalizer.cs
index 725f41f9a3d..68cd60e4284 100644
--- a/src/OrchardCore/OrchardCore.Localization.Core/PortableObject/PortableObjectStringLocalizer.cs
+++ b/src/OrchardCore/OrchardCore.Localization.Core/PortableObject/PortableObjectStringLocalizer.cs
@@ -37,7 +37,7 @@ public PortableObjectStringLocalizer(
         }
 
         /// <inheritdocs />
-        public LocalizedString this[string name]
+        public virtual LocalizedString this[string name]
         {
             get
             {
@@ -53,7 +53,7 @@ public LocalizedString this[string name]
         }
 
         /// <inheritdocs />
-        public LocalizedString this[string name, params object[] arguments]
+        public virtual LocalizedString this[string name, params object[] arguments]
         {
             get
             {
@@ -65,7 +65,7 @@ public LocalizedString this[string name]
         }
 
         /// <inheritdocs />
-        public IEnumerable<LocalizedString> GetAllStrings(bool includeParentCultures)
+        public virtual IEnumerable<LocalizedString> GetAllStrings(bool includeParentCultures)
         {
             var culture = CultureInfo.CurrentUICulture;
 
@@ -78,7 +78,7 @@ public IEnumerable<LocalizedString> GetAllStrings(bool includeParentCultures)
         public IStringLocalizer WithCulture(CultureInfo culture) => this;
 
         /// <inheritdocs />
-        public (LocalizedString, object[]) GetTranslation(string name, params object[] arguments)
+        public virtual (LocalizedString, object[]) GetTranslation(string name, params object[] arguments)
         {
             if (name == null)
             {
@@ -150,7 +150,7 @@ private IEnumerable<LocalizedString> GetAllStringsFromCultureHierarchy(CultureIn
             return allLocalizedStrings;
         }
 
-        private string GetTranslation(string[] pluralForms, CultureInfo culture, int? count)
+        protected string GetTranslation(string[] pluralForms, CultureInfo culture, int? count)
         {
             var dictionary = _localizationManager.GetDictionary(culture);
 
@@ -170,7 +170,7 @@ private string GetTranslation(string[] pluralForms, CultureInfo culture, int? co
             return pluralForms[pluralForm];
         }
 
-        private string GetTranslation(string name, string context, CultureInfo culture, int? count)
+        protected string GetTranslation(string name, string context, CultureInfo culture, int? count)
         {
             string translation = null;
             try