personally I don't think you'd be able to accomplish what you are looking for using NAT. As you want to change the destination port to 8080, it would be little tricky to make it work.
You'd have to look at other options such as WCCP which by definition should work well for Web traffic or simply putting a default route on the router pointing towards 188.8.131.52..this would not solve the port 8080 requirement instead it will send all the traffic traversing the router from inside to outside to your proxy
According to me, a better way for this would be to put the Proxy server inside your network and use it as the default gateway for the users. On the proxy you can configure the router to act as the default gateway. This would enable all the users to first send the traffic towards proxy server and then it will relay it to the router to be sent out to internet.
There might be other ways for this, hopefully we'll hear from other experts as well witrh their comments
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
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