Placing language switcher above menu | adding own flags

1. You can create a plugin to do that. Put the code below in php file. And put this file in wp-content/plugins

<?php
/*
Plugin name: Plugin Wen Business
*/
if( ! function_exists( 'wen_business_header_top_content' ) ) :
  function wen_business_header_top_content(){

    $social_in_header = wen_business_get_option( 'social_in_header' );
    $search_in_header = wen_business_get_option( 'search_in_header' );

    ?>

    <?php if ( ( 1 == $social_in_header && wen_business_is_social_menu_active() ) || 1 == $search_in_header ): ?>

      <div id="header-top-content">
        <div class="container">
          <div class="header-top">

              <div class="header-top-inner">
                <?php if ( 1 == $social_in_header ): ?>
                  <?php the_widget( 'WEN_Business_Social_Widget', array( 'icon_size' => 'small' ) ); ?>
                <?php endif ?>
                <?php if ( 1 == $search_in_header ): ?>
                  <div id="header-search-form">
                    <?php get_search_form(); ?>
                  </div><!-- #header-search-form -->
                <?php endif ?>
              </div><!-- .header-top-inner -->
				<ul id="flags">
				<?php pll_the_languages(array('show_flags'=>1, 'show_names'=>0)); ?>
				</ul>
          </div><!-- .header-top -->
        </div><!-- .container -->
      </div><!-- #header-top-content -->

    <?php endif ?>

    <?php

  }
endif;

As regards the CSS you can do that:

#flags {
	float: right;
	padding: 10px;
	margin-left: 20px;

}

.lang-item {
	list-style-type: none;
	display: inline-block;
}

I copied the code of the plugin to notepad

Use Notepad++.

I am still doing the website on the WAMP?

That’s not the origin of your problem.

saved it into .php

Could you provide a copy screen of the root of your put your file.

All seems right. I have no idea what goes wrong since it works for me.
Sorry I can’t help more.