Check for missing JSON translations (mastodon#24338)

.github/workflows/check-i18n.yml

@@ -30,13 +30,28 @@ jobs:
  ruby-version: .ruby-version
  bundler-cache: true
 
+ - name: Set up Node.js
+ uses: actions/setup-node@v3
+ with:
+ cache: yarn
+ node-version-file: '.nvmrc'
+
+ - name: Install all yarn packages
+ run: yarn --frozen-lockfile
+
+ - name: Check for missing strings in English JSON
+ run: |
+ yarn build:development
+ yarn manage:translations
+ git diff --exit-code
+
  - name: Check locale file normalization
  run: bundle exec i18n-tasks check-normalized
 
  - name: Check for unused strings
  run: bundle exec i18n-tasks unused
 
- - name: Check for missing strings in English
+ - name: Check for missing strings in English YML
  run: |
  bundle exec i18n-tasks add-missing -l en
  git diff --exit-code