title: Duplicated Label in add_menu_page
body: <p>I have created a function for a theme customization.</p>
  
  <pre><code>function create_theme_option() {
  
          add_menu_page(  'Manage Options', //Page Title 
  
                          'Theme Option', //WP Administrator Menu Title
  
                          'manage_options', //
  
                          'theme-options', //Link to a page to your Administration Area
  
                          'deploy_theme_options', //Function Name
  
                          get_template_directory_uri() . '/Plugins/Background Changer/images/icons/icon.png',//Menu Icon 
  
                          99);
  
          add_submenu_page("theme-options", "Theme Settings", "Theme Settings", 1, "theme-settings", "theme_settings");
  
          add_submenu_page("theme-options", "Manage Header", "Manage Header", 1, "manage-header", "manage_header");
  
          add_submenu_page("theme-options", "Social Media", "Social Media Links", 1, "social-media", "social_media");
  
          add_submenu_page("theme-options", "Catalog Manager", "Catalog Manager", 1, "catalog-manager", "catalog_manager");
  
      }
  </code></pre>
  
  <p>but I noticed that after the label "Theme Option" there is another text appear next to it as "Theme Option". Check the Image below:</p>
  
  <p><img src="https://i.stack.imgur.com/F4lCs.jpg" alt="http://leojarina.info/stock-data/images/screenshot.jpg"></p>
  
  <p>How can I fix this? Please help!</p>