Japanese translation improvement.
Merge pull request #1822 from kunimitaiyoh/master

Japanese translation improvement
Restore old revision grid behavior before revert
Scrolling to first visible row fixed in RevisionGrid
Merge pull request #1827 from gitextensions/hotfix/revision-grid-refresh

Hotfix for revision grid refresh
Merge remote-tracking branch 'origin/master' into feature/left-panel

Conflicts:
	GitUI/CommandsDialogs/FormBrowse.cs
	GitUI/UserControls/RevisionGrid.cs