not working with maya theme

I tried to use the woocommerce coming soon plugin.
http://www.arduino-projects4u.com/shop/
Unfortunately it did not work with the maya theme i am using. The code i use to change the text is in a file called out-of-stock-flash.php and it is given below.
is_in_stock() ) {
echo apply_filters(‘woocommerce_out_of_stock_flash’, ”.__(‘Out
of stock’, ‘yiw’ ).”, $post, $product); } I like very much the way
you have implemented this and would like it to work here also.
Any idea where to look ?

https://wordpress.org/plugins/woocommerce-coming-soon/