Format JSON and YAML using Prettier (#17823)

* Format JSON and YAML using Prettier

* Add prettier to devDep

.codeclimate.yml

@@ -1,4 +1,4 @@
-version: "2"
+version: '2'
 checks:
   argument-count:
     enabled: false
@@ -34,8 +34,8 @@ plugins:
   sass-lint:
     enabled: true
 exclude_patterns:
-- spec/
-- vendor/asset/
+  - spec/
+  - vendor/asset/
 
-- app/javascript/mastodon/locales/**/*.json
-- config/locales/**/*.yml
+  - app/javascript/mastodon/locales/**/*.json
+  - config/locales/**/*.yml