finished l10n

frontend/src/download.js

@@ -47,8 +47,11 @@ $(document).ready(function() {
       //on complete
       if (percent === 1) {
         fileReceiver.removeAllListeners('progress');
-        notify('Your download has finished.');
-        $('.title').html('Download Complete');
+        document.l10n.formatValues('downloadNotification', 'downloadFinish')
+                     .then(translated => {
+                       notify(translated[0]);
+                       $('.title').html(translated[1]);
+                     })
       }
     });
 
@@ -73,9 +76,10 @@ $(document).ready(function() {
     fileReceiver
       .download()
       .catch(() => {
-        $('.title').text(
-          'This link has expired or never existed in the first place.'
-        );
+        document.l10n.formatValue('expiredPageHeader')
+                     .then(translated => {
+                       $('.title').text(translated);
+                     })
         $('#download-btn').hide();
         $('#expired-img').show();
         console.log('The file has expired, or has already been deleted.');

public/locales/send.en-US.ftl

@@ -45,6 +45,8 @@ downloadFileSize = ({ $size })
 downloadMessage = Your friend is sending you a file with Firefox Send, a service that allows you to share files with a safe, private, and encrypted link that automatically expires to ensure your stuff does not remain online forever.
 downloadButtonLabel = Download
   .title = {downloadButtonLabel}
+downloadNotification = Your download has completed.
+downloadFinish = Download Complete
 
 sendYourFilesLink = Try Firefox Send
   .title = {sendYourFilesLink}