Use clipboard-kill-region, clipboard-kill-ring-save, and
clipboard-yank instead of undo, kill-region, and
menu-bar-kill-ring-save respectively. In MH-Letter mode, move
save-buffer and mh-fully-kill-draft icons in front of
mh-compose-insertion to be consistent with other mailers, such as
Evolution. In MH-Folder mode, move vanilla reply icon to the left of
the other reply icons. Use mail/inbox icon instead of mail, next-page
instead of page-down, delete instead of close, mail/move instead of
mail/refile, data-save instead of execute, mail/flag-for-followup
instead of highlight, contact instead of mail/alias, open instead of
fld-open, zoom-out instead of widen.