title: Taking whole json of translations language in en language
body: <p>I have rest_name attribute of <code>json</code> type and I am storing <code>json</code> of languages in it like <code>{"de": "abc", "en": "abc"......}</code>
  but when I create a new record it stores whole above <code>json</code> like
  <code>{"en": {"de": "abc", "en": "abc"......}}</code></p>
  
  <p>in model I have written like,</p>
  
  <pre><code>extend Mobility
  translates :restaurant_name_translations, type: :string, fallbacks: {fr: :en, de: :en, es: :en, nl: :en, sv: :en, tr: :en, zh: :en, "en-GB": :en, "de-DE": :en, "fr-FR": :en, "es-ES": :en, "nl-NL": :en, "sv-SE": :en, "tr-TR": :en, "zh-Hans": :en}
  
  
  # I want only to store like {"de": "abc", "en": "abc"......} in database
  </code></pre>