code: function _translateKeyboardEvent(event) {
          var hasMacCtrl = (brackets.platform === "mac") ? (event.ctrlKey) : false,
              hasCtrl = (brackets.platform !== "mac") ? (event.ctrlKey) : (event.metaKey),
              hasAlt = (event.altKey),
              hasShift = (event.shiftKey),
              key = String.fromCharCode(event.keyCode);
  
          //From the W3C, if we can get the KeyboardEvent.keyIdentifier then look here
          //As that will let us use keys like then function keys "F5" for commands. The
          //full set of values we can use is here
          //http://www.w3.org/TR/2007/WD-DOM-Level-3-Events-20071221/keyset.html#KeySet-Set
          var ident = event.keyIdentifier;
          if (ident) {
              if (ident.charAt(0) === "U" && ident.charAt(1) === "+") {
                  //This is a unicode code point like "U+002A", get the 002A and use that
                  key = String.fromCharCode(parseInt(ident.substring(2), 16));
              } else {
                  //This is some non-character key, just use the raw identifier
                  key = ident;
              }
          }
  
          // Translate some keys to their common names
          if (key === "\t") {
              key = "Tab";
          } else if (key === " ") {
              key = "Space";
          } else if (key === "\b") {
              key = "Backspace";
          } else if (key === "Help") {
              key = "Insert";
          } else if (event.keyCode === KeyEvent.DOM_VK_DELETE) {
              key = "Delete";
          } else {
              key = _mapKeycodeToKey(event.keyCode, key);
          }
  
          return _buildKeyDescriptor(hasMacCtrl, hasCtrl, hasAlt, hasShift, key);
      }
docs: Takes a keyboard event and translates it into a key in a key map