I don't think that a complete list has been compiled for 4.8.0.
I used to compile such a list based on the discussions on the forum, the beta release statements and the OpenCPN
git repository at https://github.com/OpenCPN/OpenCPN/commits/master
The git repository contains _all_ changes to the program. A lot of these changes does not concern the user/documentation directly, such as speed-ups non reported bugs, code refactoring etc, etc. In the end it's a judgment call, what to include in the documentation
I did a quick scan of git from 20170314(4.6.0 release) to 20170811(the 4.8.0 release)
Something like this
Added new dashboard clocks based on GPS local time and CPU local time.
*Re-implement Track Printout method.
*Implement SVG UserIcon support + new set of Icons
*Merge pull request #760 from seandepagnier/chartgroupkeys
1, 2, 3 keyboard keys select chart groups, 0 selects all charts
*support all conic projections
*Improve Route Printout page layout
*Optionally allow space bar to drop mark at own ship position
Aart, you are doing a great job with you're Dutch documentation
Why don't you help out with documenting changes in OpenCPN
for all to see?
If you start now you have a clean slate with the next release. Start a new thread on the forum where you can maintain an updated list for the beta development. Ask the programmers about everything that is not clear.