title: How to set language in vuetify?
body: <p>I'm trying to setup the locales with this:</p>
  
  <pre><code>Vue.use(Vuetify, {
      lang: {
          locales: { 
              'en-US' : {
                  "dataIterator": {
                      "rowsPerPageText": "Items per page:",
                      "rowsPerPageAll": "All",
                      "pageText": "{0}-{1} of {2}",
                      "noResultsText": "No matching records found",
                      "nextPage": "Next page",
                      "prevPage": "Previous page"
                  },
                  "dataTable": {
                      "rowsPerPageText": "Rows per page:"
                  },
                  "noDataText": "No data available"
              } 
          },
          current: 'en-US'
      }
  });
  </code></pre>
  
  <p>and then later I change the current locale with:</p>
  
  <pre><code>this.$vuetify.lang.current = 'en-US';
  </code></pre>
  
  <p>but I get warnings about Vue not having a translation for the current locale.</p>
  
  <p>Does anyone know why?</p>