hide dropdown language if you only have one.

Only show locale drop down if you have more than 1 language on the admin.

Themes/Adminlte/views/partials/top-nav.blade.php

@@ -19,6 +19,7 @@
                 </a>
             </li>
             <li><a href="{{ url('/') }}"><i class="fa fa-eye"></i> {{ trans('core::core.general.view website') }}</a></li>
+            @if(count(LaravelLocalization::getSupportedLocales())>1)
             <li class="dropdown">
                 <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                     <i class="fa fa-flag"></i>
@@ -37,6 +38,7 @@
                     @endforeach
                 </ul>
             </li>
+            @endif
             <!-- User Account: style can be found in dropdown.less -->
             <li class="dropdown user user-menu">
                 <a href="#" class="dropdown-toggle" data-toggle="dropdown">