Russian language

I have a website in Russian language. https://buyingrealty.net/
Need to replace the word Rent, Sale, Apartment, Houses in widget.
How can I do this?
Where and how to apply this
$filename_nospaces = $filename_nospaces.replace(/Ç/g, “C”);
$filename_nospaces = $filename_nospaces.replace(/ü/g, “u”);
$filename_nospaces = $filename_nospaces.replace(/é/g, “e”);
$filename_nospaces = $filename_nospaces.replace(/â/g, “a”);
$filename_nospaces = $filename_nospaces.replace(/ä/g, “a”);
$filename_nospaces = $filename_nospaces.replace(/à/g, “a”);
$filename_nospaces = $filename_nospaces.replace(/ç/g, “c”);
$filename_nospaces = $filename_nospaces.replace(/ê/g, “e”);
$filename_nospaces = $filename_nospaces.replace(/ë/g, “e”);
$filename_nospaces = $filename_nospaces.replace(/è/g, “e”);
$filename_nospaces = $filename_nospaces.replace(/ï/g, “i”);
$filename_nospaces = $filename_nospaces.replace(/î/g, “i”);
$filename_nospaces = $filename_nospaces.replace(/ì/g, “i”);
$filename_nospaces = $filename_nospaces.replace(/Ä/g, “A”);
$filename_nospaces = $filename_nospaces.replace(/Å/g, “A”);
$filename_nospaces = $filename_nospaces.replace(/É/g, “E”);
$filename_nospaces = $filename_nospaces.replace(/æ/g, “ae”);
$filename_nospaces = $filename_nospaces.replace(/Æ/g, “AE”);
$filename_nospaces = $filename_nospaces.replace(/ô/g, “o”);
$filename_nospaces = $filename_nospaces.replace(/ö/g, “o”);
$filename_nospaces = $filename_nospaces.replace(/ò/g, “o”);
$filename_nospaces = $filename_nospaces.replace(/û/g, “u”);
$filename_nospaces = $filename_nospaces.replace(/ù/g, “u”);
$filename_nospaces = $filename_nospaces.replace(/ÿ/g, “y”);
$filename_nospaces = $filename_nospaces.replace(/Ö/g, “O”);
$filename_nospaces = $filename_nospaces.replace(/Ü/g, “U”);
$filename_nospaces = $filename_nospaces.replace(/á/g, “a”);
$filename_nospaces = $filename_nospaces.replace(/í/g, “i”);
$filename_nospaces = $filename_nospaces.replace(/ó/g, “o”);
$filename_nospaces = $filename_nospaces.replace(/ú/g, “u”);
$filename_nospaces = $filename_nospaces.replace(/ñ/g, “n”);
$filename_nospaces = $filename_nospaces.replace(/Ñ/g, “N”);
$filename_nospaces = $filename_nospaces.replace(/¿/g, “?”);
$filename_nospaces = $filename_nospaces.replace(/А/g, “A”);
$filename_nospaces = $filename_nospaces.replace(/Б/g, “B”);
$filename_nospaces = $filename_nospaces.replace(/В/g, “V”);
$filename_nospaces = $filename_nospaces.replace(/Г/g, “G”);
$filename_nospaces = $filename_nospaces.replace(/Д/g, “D”);
$filename_nospaces = $filename_nospaces.replace(/Е/g, “E”);
$filename_nospaces = $filename_nospaces.replace(/Ж/g, “ZH”);
$filename_nospaces = $filename_nospaces.replace(/З/g, “Z”);
$filename_nospaces = $filename_nospaces.replace(/И/g, “I”);
$filename_nospaces = $filename_nospaces.replace(/Й/g, “Y”);
$filename_nospaces = $filename_nospaces.replace(/К/g, “K”);
$filename_nospaces = $filename_nospaces.replace(/Л/g, “L”);
$filename_nospaces = $filename_nospaces.replace(/М/g, “M”);
$filename_nospaces = $filename_nospaces.replace(/Н/g, “N”);
$filename_nospaces = $filename_nospaces.replace(/О/g, “O”);
$filename_nospaces = $filename_nospaces.replace(/П/g, “P”);
$filename_nospaces = $filename_nospaces.replace(/Р/g, “R”);
$filename_nospaces = $filename_nospaces.replace(/С/g, “S”);
$filename_nospaces = $filename_nospaces.replace(/Т/g, “T”);
$filename_nospaces = $filename_nospaces.replace(/У/g, “U”);
$filename_nospaces = $filename_nospaces.replace(/Ф/g, “F”);
$filename_nospaces = $filename_nospaces.replace(/Х/g, “H”);
$filename_nospaces = $filename_nospaces.replace(/Ц/g, “TS”);
$filename_nospaces = $filename_nospaces.replace(/Ч/g, “CH”);
$filename_nospaces = $filename_nospaces.replace(/Ш/g, “SH”);
$filename_nospaces = $filename_nospaces.replace(/Щ/g, “SCH”);
$filename_nospaces = $filename_nospaces.replace(/Ъ/g, “‘”);
$filename_nospaces = $filename_nospaces.replace(/Ы/g, “Y”);
$filename_nospaces = $filename_nospaces.replace(/Ь/g, “”);
$filename_nospaces = $filename_nospaces.replace(/Э/g, “E”);
$filename_nospaces = $filename_nospaces.replace(/Ю/g, “YU”);
$filename_nospaces = $filename_nospaces.replace(/Я/g, “YA”);
$filename_nospaces = $filename_nospaces.replace(/а/g, “a”);
$filename_nospaces = $filename_nospaces.replace(/б/g, “b”);
$filename_nospaces = $filename_nospaces.replace(/в/g, “v”);
$filename_nospaces = $filename_nospaces.replace(/г/g, “g”);
$filename_nospaces = $filename_nospaces.replace(/д/g, “d”);
$filename_nospaces = $filename_nospaces.replace(/е/g, “e”);
$filename_nospaces = $filename_nospaces.replace(/ж/g, “zh”);
$filename_nospaces = $filename_nospaces.replace(/з/g, “z”);
$filename_nospaces = $filename_nospaces.replace(/и/g, “i”);
$filename_nospaces = $filename_nospaces.replace(/й/g, “y”);
$filename_nospaces = $filename_nospaces.replace(/к/g, “k”);
$filename_nospaces = $filename_nospaces.replace(/л/g, “l”);
$filename_nospaces = $filename_nospaces.replace(/м/g, “m”);
$filename_nospaces = $filename_nospaces.replace(/н/g, “n”);
$filename_nospaces = $filename_nospaces.replace(/о/g, “o”);
$filename_nospaces = $filename_nospaces.replace(/п/g, “p”);
$filename_nospaces = $filename_nospaces.replace(/р/g, “r”);
$filename_nospaces = $filename_nospaces.replace(/с/g, “s”);
$filename_nospaces = $filename_nospaces.replace(/т/g, “t”);
$filename_nospaces = $filename_nospaces.replace(/у/g, “u”);
$filename_nospaces = $filename_nospaces.replace(/ф/g, “f”);
$filename_nospaces = $filename_nospaces.replace(/х/g, “h”);
$filename_nospaces = $filename_nospaces.replace(/ц/g, “ts”);
$filename_nospaces = $filename_nospaces.replace(/ч/g, “ch”);
$filename_nospaces = $filename_nospaces.replace(/ш/g, “sh”);
$filename_nospaces = $filename_nospaces.replace(/щ/g, “sch”);
$filename_nospaces = $filename_nospaces.replace(/ы/g, “y”);
$filename_nospaces = $filename_nospaces.replace(/Ы/g, “Y”);
$filename_nospaces = $filename_nospaces.replace(/ь/g, “”);
$filename_nospaces = $filename_nospaces.replace(/э/g, “e”);
$filename_nospaces = $filename_nospaces.replace(/ю/g, “yu”);
$filename_nospaces = $filename_nospaces.replace(/я/g, “ya”);

Maybe another option?