バリデーションのエラーメッセージを日本語にしたい

実現したいこと

新規登録のバリデーションのエラーメッセージを日本語化したい

該当のソースコード

application.rb
1# Require the gems listed in Gemfile, including any gems
2# you've limited to :test, :development, or :production.
3Bundler.require(*Rails.groups)
4
5module InstructorMatching
6  class Application < Rails::Application
7    # Initialize configuration defaults for originally generated Rails version.
8    config.load_defaults 7.0
9
10    config.i18n.default_locale = :ja
11
12    # Configuration for the application, engines, and railties goes here.
13    #
14    # These settings can be overridden in specific environments using the files
15    # in config/environments, which are processed later.
16    #
17    # config.time_zone = "Central Time (US & Canada)"
18    # config.eager_load_paths << Rails.root.join("extras")
19
20    # Don't generate system test files.
21    config.generators.system_tests = nil
22  end
23end

config/locales/ja.yml
1ja:
2  activerecord:
3    attributes:
4      user:
5        name: "表示名"
6        password: "パスワード"
7        password_confirmation: "パスワード確認"
8        email: "メールアドレス"

erb
1<% if instructor.errors.any? %>
2      <div style="color: red">
3        <h2><%= pluralize(instructor.errors.count, "error") %> prohibited this instructor from being saved:</h2>
4
5        <ul>
6          <% instructor.errors.each do |error| %>
7            <li><%= error.full_message %></li>
8          <% end %>
9        </ul>
10      </div>
11 <% end %>
12

試したこと

https://zenn.dev/machamp/articles/rails-validation-message
こちらの記事を参考にgemのインストールも完了しております。

gem install 'rails-i18n'

こちらのコマンドのみ実行済です。

補足

もしかしたらgemが正しくインストールされていない可能性があります...

Gemfile
1source "https://rubygems.org"
2git_source(:github) { |repo| "https://github.com/#{repo}.git" }
3
4ruby "3.2.2"
5
6# Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"
7gem "rails", "~> 7.0.5"
8
9# The original asset pipeline for Rails [https://github.com/rails/sprockets-rails]
10gem "sprockets-rails"
11
12# Use mysql as the database for Active Record
13gem "mysql2", "~> 0.5"
14
15# Use the Puma web server [https://github.com/puma/puma]
16gem "puma", "~> 5.0"
17
18# Use JavaScript with ESM import maps [https://github.com/rails/importmap-rails]
19gem "importmap-rails"
20
21# Hotwire's SPA-like page accelerator [https://turbo.hotwired.dev]
22gem "turbo-rails"
23
24# Hotwire's modest JavaScript framework [https://stimulus.hotwired.dev]
25gem "stimulus-rails"
26
27# Build JSON APIs with ease [https://github.com/rails/jbuilder]
28gem "jbuilder"
29
30# Use Redis adapter to run Action Cable in production
31# gem "redis", "~> 4.0"
32
33# Use Kredis to get higher-level data types in Redis [https://github.com/rails/kredis]
34# gem "kredis"
35
36# Use Active Model has_secure_password [https://guides.rubyonrails.org/active_model_basics.html#securepassword]
37# gem "bcrypt", "~> 3.1.7"
38
39# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
40gem "tzinfo-data", platforms: %i[ mingw mswin x64_mingw jruby ]
41
42# Reduces boot times through caching; required in config/boot.rb
43gem "bootsnap", require: false
44
45# Use Sass to process CSS
46# gem "sassc-rails"
47
48# Use Active Storage variants [https://guides.rubyonrails.org/active_storage_overview.html#transforming-images]
49# gem "image_processing", "~> 1.2"
50
51gem "ridgepole"
52
53gem "seed-fu"
54
55gem "sorcery"
56
57gem "administrate"
58
59group :development, :test do
60  # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
61  gem "debug", platforms: %i[ mri mingw x64_mingw ]
62end
63
64group :development do
65  # Use console on exceptions pages [https://github.com/rails/web-console]
66  gem "web-console"
67
68  # Add speed badges [https://github.com/MiniProfiler/rack-mini-profiler]
69  # gem "rack-mini-profiler"
70
71  # Speed up commands on slow machines / big apps [https://github.com/rails/spring]
72  # gem "spring"
73end

gemのインストールのやり方も教えていただけますと幸いです。
よろしくお願い致します。

追加記載

Gemfileにgemの追加をし、bundle installを実行しました。

2. ja.ymlファイルの作成

3. application.rbに1行追加

ターミナルでのエラー内容

viewのSyntaxerrorの発生

以下一部抜粋しているviewの中身になります

解決

ja.ymlファイルをこのようにすることで解決できました

ya.yml
1ja:
2  activerecord:
3    attributes:
4      instructor:
5        name: "名前"
6        email: "メールアドレス"
7        password: "パスワード"
8        password_confirmation: "パスワード（確認用）"
9    errors:
10      models:
11        instructor:
12          attributes:
13            name:
14              blank: "を入力してください"
15            email:
16              taken: "は既に存在します"
17            password:
18              too_short: "は %{count} 文字以上で入力してください"
19            password_confirmation:
20              blank: "を入力してください"
21      messages:
22        confirmation: "と%{attribute}が一致しません"
23
24モデルと合わせることが重要でした!!
25