MAGETWO-89094: Allow editing of button text from stage

- add key codes to prevent styling

Author: anthoula

app/code/Magento/Ui/view/base/web/js/lib/key-codes.js

@@ -20,6 +20,9 @@ define([], function () {
         39: 'pageRightKey',
         17: 'ctrlKey',
         18: 'altKey',
-        16: 'shiftKey'
+        16: 'shiftKey',
+        66: 'bKey',
+        73: 'iKey',
+        85: 'uKey'
     };
 });