Coupon code requires two submissions before it's accepted, also missing feedback when entering

The addition of the "coupon code" is great, but just a few details that might have been overlooked so far.

- When you enter the code, it takes you back to the subscription list. Then click on the subscription again and enter the code again and THEN it accepts it.

- When you enter a non-existent code, it accepts it, though it doesn't change the price. Some feedback that the code doesn't exist would be handy.

- The formatting, colour and font-sizing is rough around the edges and could use basic polish.

Thanks, devs!