modified. Gemfile
modified. Task model validate

name, description
fixed. task request test

task model validate の影響
modified. task create

task model のvalidate結果によって動作変更
modified. task update

task model のvalidate結果によって動作変更
added. form error

error field の色付け
added. Gemfile rails-i18n

rails-i18n の追加に伴い、errors.yml は不要に
modified. task form error massage
modified. form label
added. time zone setting
new. Category model
added. task view category
added. route categories
added. Task model association Category
modified. task migration

taskのcategory_id追加を、元々のmigrationファイルに移動
modified. Category seeds