1. No way to cancel

I tried to merge 2 releases, but changed my mind and tried to merge 2 other releases.
Now I've 4 releases selected to merge but I've no way to remove the 2 old ones, and no way to cancel the merge process at all.

2. The 2 "Merge releases" and "Merge process" sections on http://test.musicbrainz.org/release/merge are redundant and confusing.
"Merge process" only have a "Merge" button that just load the exact same page. I think a "Select more releases" button should be here instead.

3. No default target release-group is selected, and if you don't select a target release-group you've no error message and are still on the same exact page.