title: Rails 3 translations within models in production
body: <p>I'm trying to translate an app into Japanese and everything was going smoothly until I put it into production.</p>
  
  <p>As cache_classes is now true any translation within a model reverts to the default locale.</p>
  
  <p>I know I'm probably supposed to target the translations directly in the yml file but I'm not sure how I would do that for the following simplified code:</p>
  
  <pre><code>class TimeseriesForecast &lt; ActiveRecord::Base
  
    @@field_names = {
     :location_name =&gt; I18n.t('forecast_timeseries.location_name'),
     :local_date_time =&gt; I18n.t('forecast_timeseries.local_date_time'),
     :zulu_date_time =&gt; I18n.t('forecast_timeseries.zulu_date_time'),
     :temp_mean =&gt; I18n.t('forecast_timeseries.temp_mean')
    }
  
  end
  </code></pre>
  
  <p>Many thanks</p>