Merge pull request #2205 from abpframework/maliming/hideLanguage

Hide language switch menu if the app has only one language.

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic/Themes/Basic/Components/Toolbar/LanguageSwitch/Default.cshtml

@@ -1,6 +1,9 @@
-@using Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic.Themes.Basic.Components.Toolbar.LanguageSwitch
+@using System.Linq
+@using Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic.Themes.Basic.Components.Toolbar.LanguageSwitch
 @model LanguageSwitchViewComponentModel
-<div class="dropdown">
+@if (Model.OtherLanguages.Any())
+{
+    <div class="dropdown">
         <a class="nav-link dropdown-toggle" href="#" role="button" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
             @Model.CurrentLanguage.DisplayName
         </a>
@@ -11,4 +14,5 @@
                 <a class="dropdown-item" href="/Abp/Languages/Switch?culture=@(language.CultureName)&uiCulture=@(language.UiCultureName)&returnUrl=@Context.Request.Path">@language.DisplayName</a>
             }
         </div>
-</div>
+    </div> 
+}