MD Settings: Polish string for disabling internal PDF plugin

chrome/browser/resources/settings/site_settings/pdf_documents.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="../controls/settings_toggle_button.html">
 <link rel="import" href="../settings_shared_css.html">
 
 <dom-module id="settings-pdf-documents">
   <template>
     <style include="settings-shared">
     .secondary {
       margin-top: 0;  /* Cancel separation between main and secondary text. */
     }
     </style>
     <div class="settings-box first two-line">
       <settings-toggle-button id="toggle" class="start"
-          label="$i18n{siteSettingsPdfDifferentApplication}"
+          label="$i18n{siteSettingsPdfDownloadPdfs}"
           pref="{{prefs.plugins.always_open_pdf_externally}}">
       </settings-toggle-button>
     </div>
   </template>
   <script src="pdf_documents.js"></script>
 </dom-module>