Revert "Remove tooltip from Try It button. (Fixes #1260)"

src/components/preview-modal/preview-modal.jsx

@@ -54,6 +54,7 @@ const PreviewModal = ({intl, ...props}) => (
                 </button>
                 <button
                     className={styles.okButton}
+                    title="tryit"
                     onClick={props.onTryIt}
                 >
                     <FormattedMessage