GetText: function(tid,id){
if(id==undefined)id=0;
switch(tid){
case 'gbut':return decodeURIComponent('%D0%9F%D0%BE%D0%BB%D1%83%D1%87%D0%B8%D1%82%D1%8C%20%D0%BA%D0%BE%D0%B4%20%D0%B1%D0%BB%D0%BE%D0%BA%D0%B0');break;
case 'downl1':var s=decodeURIComponent('%D0%A1%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C%20%25s%20%3Cbr%3E%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE%20%D0%B8%20%D0%B1%D0%B5%D0%B7%20%D1%80%D0%B5%D0%B3%D0%B8%D1%81%D1%82%D1%80%D0%B0%D1%86%D0%B8%D0%B8.');return s.replace(/%s/i,this.Arr[id]['full']);break;
case 'gccapt':
return decodeURIComponent('%D0%9F%D0%BE%D0%BB%D1%83%D1%87%D0%B5%D0%BD%D0%B8%D0%B5%20%D0%BA%D0%BE%D0%B4%D0%B0...');
break;
...
Лучше все-таки
'\u041f\u0440\u0438...'
И сделать не switch-case, а объект.
return {gbut: 'Hello', downl1: 'World'}[id] || '';