Need help in decoding Bitmask flags in Javascript

beginner in using bitwise operators here. I understand the differences between them, however I'm not able to decode correctly the user language from them. basically the backend gives me a number which I need to use for decoding user language.

static const int TlvLanguageMask = 0x0700;
static const int TlvEnglish = 0x0000;
static const int TlvFrench = 0x0100;
static const int TlvSwedish = 0x0200;
static const int TlvCzech = 0x0300;
static const int TlvGerman = 0x0400;
static const int TlvSpanish = 0x0500;
static const int TlvItalian = 0x0600;
static const int TlvRomanian = 0x0700;

this is what the backend written in C++ uses for setting the languages. in my frontend written in Javascript I did the following thing:

 function decodeLanguagevalue(Languagecode){
  let language;
  const languages={
  languagemask:1792,//1110 0000 000
  english:0,//0
  french:128<<1,//256 -->1000 0000 0
  swedish:128<<2,//512-->1000 0000 00
  czech:512^256,//768 -->1100 0000 00 french+swedish?
  German:128<<3,//1024-->1000 0000 000
  Spanish:1024^256,//1280-->1010 0000 000 german+french?
  Italian:1280^256,//1536--> 1100 0000 000 spanish+french?
  Romanian:1536^256//1792--> 1110 0000 000 italian+french?


}
  switch (Languagecode) {
    case Languagecode & languages.english:
      language="UK"
      break;
    case Languagecode & languages.french:
      language="French"
      break;
    case Languagecode & languages.swedish:
      language="Swedish"
      break;
    case Languagecode  & languages.french & languages.swedish:
      language="CZech"
      break;
    case Languagecode & languages.German:
      language="German"
      break;
    case Languagecode & languages.German & languages.french:
      language="Spanish"
      break;
    case Languagecode & languages.Spanish & languages.french:
      language="Italian"
      break;
    case Languagecode & languages.Italian & languages.french:
      language="Romanian" 
      break;
    default:
      language="Unknown"
      break;
  }
  return language

}

however this function always returns me Unknown. This basically means that I messed up with bitwise operators on the frontend.Can someone enlight me on these and help me decoding them correctly? thank you