Added items after v4.1.7

[kenjis]

The following item(s) are added after v4.1.7:

• Migrations.php
• Database.php
• View.php

You can check your lang translation status:

$ git checkout develop
$ git fetch upstream
$ git merge upstream/develop
$ bin/test ja // ← specify your lang

[kenjis]

Added items in Database.php and View.php.