Update CHANGELOG.md
Revert "trivial: s,_Exit,Exit, in ExitItem.py"

This reverts commit 6f95f1820ffa49977060cae681f8e9e9ccd74aaf.
Revert "Fix typos in button labels (s,_Stop,Stop,)"

This reverts commit b16a890053ca2dbc8a69f1144a2aba85993319f0.
Fix accelerators for buttons and menuitems.