Multilingual site: Need to change from flags to abbreviations

Site URL: https://www.motivationbranding.com/

Hi does anyone know how I can replace the flags to abbreviations EN NO FR? 
 

In Code Injection, edit this code

<script>
/*setup language switcher with flags*/
$('body').prepend('<div class="language"><a href="/en/home" class="lang-en"><span class="flag-icon flag-icon-gb"></span></a>  <a href="/no/home/" class="lang-no"><span class="flag-icon flag-icon-no"></span></a>  <a href="/fr/home/" class="lang-fr"><span class="flag-icon flag-icon-ca"></span></a></div>');
</script>

to this code

<script>
/*setup language switcher with flags*/
$('body').prepend('<div class="language"><a href="/en/home" class="lang-en"><span>EN</span></a>  <a href="/no/home/" class="lang-no"><span>NO</span></a>  <a href="/fr/home/" class="lang-fr"><span>FR</span></a></div>');
</script>

Thank you so much! Mister Tuanphan.