guide-ja revised [ci skip] (#16143)
* guide-ja/intro revised [ci skip]
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* docs/guide-ja translation for "Active Record" revised [ci skip]
* docs/guide-ja/structure small fix [ci skip]
* docs/guide-ja/structure-models.md revised [ci skip]
* docs/guide-ja/structure-views.md reviewed [ci skip]
* guide-ja/structure-modules.md guide-ja/structure-filters.md revised [ci skip]
* guide-ja/structure-widgets.md updated [ci skip]
* guide-ja/structure revised [ci skip]
* guide-ja/structure-extensions.md revised [ci skip]
* guide-ja/structure-extensions.md revised [ci skip]
* guide-ja/intro adjusted line counts [ci skip]
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* guide-ja/structure-extensions.md typo fixed [ci skip]
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