refined the translation of the word "issue"
added docs/internals-ja/report-an-issue.md
added docs/internals-ja/versions.md
Revert "implementing mongodb panel bootstrap behavior #3855"
Merge pull request #5574 from yiisoft/revert-5566-3855-mongodb-panel-bootstrap

Revert "implementing mongodb panel bootstrap behavior #3855"
Update structure-controllers.md
Merge pull request #5578 from AnegvE/patch-1

[skip ci] Update structure-controllers.md
Update structure-controllers.md
Merge pull request #5579 from AnegvE/patch-2

[ci skip] Update structure-controllers.md
added docs/guide-ja/intro-yii.md
Merge branch 'master' into docs-ja-2014-10-15b
Merge pull request #5581 from softark/docs-ja-2014-10-15b

[ci skip] Docs ja 2014 10 15b