introduce Japanese translations, still need ironing.
fix translation mistakes.
change: better way to due with history canvas data.

Signed-off-by: liuyanghejerry <liuyanghejerry@126.com>
change: restore history functionality.

Signed-off-by: liuyanghejerry <liuyanghejerry@126.com>
Merge branch 'dev' of gitcafe.com:liuyanghejerry/painttyWidget into dev
fix: fully restore history functionality.

Signed-off-by: liuyanghejerry <liuyanghejerry@126.com>