[Components In-Depth]: Custom Eventsの翻訳 (#935)
[Components In-Depth]: Custom Eventsの翻訳 (#935)

* add first draft

* add first draft

* remove original text

* add more fixes

* add review suggestions

* remove some garbage and add better text

* fix typo

potato4d/jp.vuejs.org,vuejs/jp.vuejs.org,potato4d/jp.vuejs.org,vuejs/jp.vuejs.org