message: i18n "Cancel" alt text.
diff: @@ -87,7 +87,7 @@ export default React.createClass({
  {/* Delete widget */}
  <img src="img/cancel.svg"
  className="mx_filterFlipColor mx_AppTileMenuBarWidget"
  - width="8" height="8" alt="Cancel"
  + width="8" height="8" alt={_t("Cancel")}
  onClick={this._onDeleteClick}
  />
  </span>
  