Polylang and tawk.to switch lang chat

Good day.
Delivered this plug-in and there was no limit to the joy.
But I got problematic when switching the language of the chat and the department of the recipients of alerts.
Namely:
now solved the issue of switching the language by creating several chats and assigning these chats to different languages.
1) 3 languages: Rus, Eng, De.
2) in the function.php file, the variable was ignored in the translation of the lines, each language translated accordingly: Rus, Eng, De.
3) under them wrote a check on the frontend namely:

<script type="text/javascript">
  var lang= "<?php echo pll__('clang'); ?>";  //clang - variable for Polylang, in which the name of the language is stored
    switch (lang) {
      case "Rus":
        var TawkL='https://embed.tawk.to/-----------/default'; //TawkL - whose variable is assigned a value as a link to the chat widget
        alert ('ru: '+ TawkL);
      break;
      case "Eng":
	var TawkL='https://embed.tawk.to/-----------/-------eng';
	alert ('de: '+ TawkL);
      break;
	case "De":
	var TawkL='https://embed.tawk.to/-----------/---------de';
      alert= ('en: '+ TawkL);
      break;
    };
  var Tawk_API=Tawk_API||{}, Tawk_LoadStart=new Date();
  (function(){
    var s1=document.createElement("script"),s0=document.getElementsByTagName("script")[0];
    s1.async=true;
    s1.src= TawkL;
    s1.charset='UTF-8';
    s1.setAttribute('crossorigin','*');
    s0.parentNode.insertBefore(s1,s0);
  })();
</script>

And so the events are being worked on as evidenced by (“alert (‘ru: ‘+ TawkL);”) and the change of languages “supposedly” occurs, but after several reloads of the page …
what could be the problem?

And the second problem is how to assign a specific chat, a specific department to notify?
For Renee, thank you for your help!