diff --git a/zero.Core/Validation/LanguageValidator.cs b/zero.Core/Validation/LanguageValidator.cs
index f7b3671b..2a1b9c37 100644
--- a/zero.Core/Validation/LanguageValidator.cs
+++ b/zero.Core/Validation/LanguageValidator.cs
@@ -14,7 +14,7 @@ namespace zero.Core.Validation
       RuleFor(x => x.Code).Length(2, 10).Culture();
       RuleFor(x => x.IsDefault).Unique(store).When(x => x.IsDefault).WithMessage("@language.errors.default_unique");
       RuleFor(x => x.IsDefault).ExpectAnyUnique(store, expectedValue: true).When(x => !x.IsDefault).WithMessage("@language.errors.needs_default");
-      RuleFor(x => x.InheritedLanguageId).Must((entity, value) => !entity.Id.Equals(value, StringComparison.InvariantCultureIgnoreCase)).WithMessage("@language.errors.fallback_invalid");
+      RuleFor(x => x.InheritedLanguageId).Must((entity, value) => !entity.Id.Equals(value, StringComparison.InvariantCultureIgnoreCase)).When(x => !x.Id.IsNullOrEmpty()).WithMessage("@language.errors.fallback_invalid");
       RuleFor(x => x.InheritedLanguageId).Equal((string)null).When(x => x.IsDefault).WithMessage("@language.errors.default_no_fallback");
       RuleFor(x => x.InheritedLanguageId).Exists(store);
       RuleFor(x => x.IsOptional).Equal(false).When(x => x.IsDefault).WithMessage("@language.errors.default_not_optional");
diff --git a/zero.Core/Validation/MediaValidator.cs b/zero.Core/Validation/MediaValidator.cs
new file mode 100644
index 00000000..c7027fdd
--- /dev/null
+++ b/zero.Core/Validation/MediaValidator.cs
@@ -0,0 +1,15 @@
+using FluentValidation;
+using zero.Core.Api;
+using zero.Core.Entities;
+
+namespace zero.Core.Validation
+{
+  public class MediaValidator : ZeroValidator<IMedia>
+  {
+    public MediaValidator(IBackofficeStore store)
+    {
+      RuleFor(x => x.Name).Length(2, 80);
+      RuleFor(x => x.IsActive).Equal(true);
+    }
+  }
+}
\ No newline at end of file
diff --git a/zero.Core/Validation/PageValidator.cs b/zero.Core/Validation/PageValidator.cs
new file mode 100644
index 00000000..742b5218
--- /dev/null
+++ b/zero.Core/Validation/PageValidator.cs
@@ -0,0 +1,14 @@
+using FluentValidation;
+using zero.Core.Api;
+using zero.Core.Entities;
+
+namespace zero.Core.Validation
+{
+  public class PageValidator : ZeroValidator<IPage>
+  {
+    public PageValidator()
+    {
+      
+    }
+  }
+}
\ No newline at end of file
diff --git a/zero.Core/Validation/SetupModelValidator.cs b/zero.Core/Validation/SetupModelValidator.cs
index 7a767934..975dec7b 100644
--- a/zero.Core/Validation/SetupModelValidator.cs
+++ b/zero.Core/Validation/SetupModelValidator.cs
@@ -4,7 +4,7 @@ using zero.Core.Extensions;
 
 namespace zero.Core.Validation
 {
-  public class SetupModelValidator : AbstractValidator<SetupModel>
+  public class SetupModelValidator : ZeroValidator<SetupModel>
   {
     public SetupModelValidator()
     {
diff --git a/zero.Core/Validation/UserRoleValidator.cs b/zero.Core/Validation/UserRoleValidator.cs
index 41a4872d..0ca8da25 100644
--- a/zero.Core/Validation/UserRoleValidator.cs
+++ b/zero.Core/Validation/UserRoleValidator.cs
@@ -6,7 +6,7 @@ using System;
 
 namespace zero.Core.Validation
 {
-  public class UserRoleValidator : AbstractValidator<IUserRole>
+  public class UserRoleValidator : ZeroValidator<IUserRole>
   {
     const string SECTION_CLAIM = "section.";
 
diff --git a/zero.Web.UI/App/editor/editor.vue b/zero.Web.UI/App/editor/editor.vue
index 7f6fcc4f..ddae8038 100644
--- a/zero.Web.UI/App/editor/editor.vue
+++ b/zero.Web.UI/App/editor/editor.vue
@@ -22,7 +22,7 @@
           </slot>
           <slot name="settings-properties"></slot>
         </div>
-        <div class="ui-box" v-if="value.id">
+        <div class="ui-box is-light" v-if="value.id">
           <slot name="infos">
             <ui-property v-if="value.id" label="@ui.id" :is-text="true">
               {{value.id}}
diff --git a/zero.Web.UI/App/pages/pages/page-info.vue b/zero.Web.UI/App/pages/pages/page-info.vue
index 94ae3889..6d143cff 100644
--- a/zero.Web.UI/App/pages/pages/page-info.vue
+++ b/zero.Web.UI/App/pages/pages/page-info.vue
@@ -17,7 +17,7 @@
           <ui-daterangepicker :value="{ from: value.publishDate, to: value.unpublishDate }" @input="onRangeChange" :class="{ 'is-primary': value.publishDate || value.unpublishDate }" />
         </ui-property>
       </div>
-      <div class="ui-box">
+      <div class="ui-box is-light">
         <ui-property v-if="!isCreate" label="@ui.id" :is-text="true">
           {{value.id}}
         </ui-property>
diff --git a/zero.Web/Defaults/ZeroBackofficePlugin.cs b/zero.Web/Defaults/ZeroBackofficePlugin.cs
index cbd07342..23db6821 100644
--- a/zero.Web/Defaults/ZeroBackofficePlugin.cs
+++ b/zero.Web/Defaults/ZeroBackofficePlugin.cs
@@ -16,11 +16,10 @@ namespace zero.Web.Defaults
   {
     public void ConfigureServices(IServiceCollection services, IConfiguration configuration) 
     {
-      services.AddAll(typeof(IValidator<>), ServiceLifetime.Scoped);
+      //services.AddAll(typeof(IValidator<>), ServiceLifetime.Scoped);
       //services.AddAll(typeof(IValidator), ServiceLifetime.Scoped);
 
       services.AddTransient<IApplication, Application>();
-      //services.AddTransient<IValidator<IApplication>, ApplicationValidator>();
       services.AddTransient<ICountry, Country>();
       services.AddTransient<ILanguage, Language>();
       services.AddTransient<ITranslation, Translation>();
@@ -30,6 +29,16 @@ namespace zero.Web.Defaults
       services.AddTransient<IMediaFolder, MediaFolder>();
       services.AddTransient<IPreview, Preview>();
 
+      services.AddTransient<IValidator<IApplication>, ApplicationValidator>();
+      services.AddTransient<IValidator<ICountry>, CountryValidator>();
+      services.AddTransient<IValidator<ILanguage>, LanguageValidator>();
+      services.AddTransient<IValidator<ITranslation>, TranslationValidator>();
+      services.AddTransient<IValidator<IPage>, PageValidator>();
+      services.AddTransient<IValidator<IMedia>, MediaValidator>();
+      services.AddTransient<IValidator<IMediaFolder>, MediaFolderValidator>();
+      services.AddTransient<IValidator<IUserRole>, UserRoleValidator>();
+      services.AddTransient<IValidator<IUser>, BackofficeUserValidator>();
+
       services.AddTransient<IApplicationsApi, ApplicationsApi>();
       services.AddTransient<ICountriesApi, CountriesApi>();
       services.AddTransient<ILanguagesApi, LanguagesApi>();