diff --git a/assets/src/bundles/vault/vault-ui.js b/assets/src/bundles/vault/vault-ui.js
index 25a93f42..0f70ed59 100644
--- a/assets/src/bundles/vault/vault-ui.js
+++ b/assets/src/bundles/vault/vault-ui.js
@@ -1,260 +1,264 @@
 /**
  * Copyright (C) 2018-2019  The Software Heritage developers
  * See the AUTHORS file at the top-level directory of this distribution
  * License: GNU Affero General Public License version 3, or any later version
  * See top-level LICENSE file for more information
  */
 
 import {handleFetchError, handleFetchErrors, csrfPost} from 'utils/functions';
 import vaultTableRowTemplate from './vault-table-row.ejs';
 
 const progress =
   `<div class="progress">
     <div class="progress-bar progress-bar-success progress-bar-striped"
           role="progressbar" aria-valuenow="100" aria-valuemin="0"
           aria-valuemax="100" style="width: 100%;height: 100%;">
     </div>
   </div>;`;
 
 const pollingInterval = 5000;
 let checkVaultId;
 
 function updateProgressBar(progressBar, cookingTask) {
   if (cookingTask.status === 'new') {
     progressBar.css('background-color', 'rgba(128, 128, 128, 0.5)');
   } else if (cookingTask.status === 'pending') {
     progressBar.css('background-color', 'rgba(0, 0, 255, 0.5)');
   } else if (cookingTask.status === 'done') {
     progressBar.css('background-color', '#5cb85c');
   } else if (cookingTask.status === 'failed') {
     progressBar.css('background-color', 'rgba(255, 0, 0, 0.5)');
     progressBar.css('background-image', 'none');
   }
   var text = cookingTask.progress_message || cookingTask.status;
-  text = text.split('\n', 2)[0];
-  progressBar.text(text);
+  var firstLine, rest;
+  [firstLine, ...rest] = text.split('\n', 2);
+  progressBar.text(firstLine);
+  if (rest.length) {
+    progressBar.prop('title', rest[0]);
+  }
   if (cookingTask.status === 'new' || cookingTask.status === 'pending') {
     progressBar.addClass('progress-bar-animated');
   } else {
     progressBar.removeClass('progress-bar-striped');
   }
 }
 
 let recookTask;
 
 // called when the user wants to download a cooked archive
 export async function fetchCookedObject(fetchUrl) {
   recookTask = null;
   // first, check if the link is still available from the vault
   const response = await fetch(fetchUrl);
 
   // link is still alive, proceed to download
   if (response.ok) {
     $('#vault-fetch-iframe').attr('src', fetchUrl);
     // link is dead
   } else {
     // get the associated cooking task
     const vaultCookingTasks = JSON.parse(localStorage.getItem('swh-vault-cooking-tasks'));
     for (let i = 0; i < vaultCookingTasks.length; ++i) {
       if (vaultCookingTasks[i].fetch_url === fetchUrl) {
         recookTask = vaultCookingTasks[i];
         break;
       }
     }
     // display a modal asking the user if he wants to recook the archive
     $('#vault-recook-object-modal').modal('show');
   }
 }
 
 // called when the user wants to recook an archive
 // for which the download link is not available anymore
 export async function recookObject() {
   if (recookTask) {
     // stop cooking tasks status polling
     clearTimeout(checkVaultId);
     // build cook request url
     let cookingUrl;
     if (recookTask.bundle_type === 'flat') {
       cookingUrl = Urls.api_1_vault_cook_flat(recookTask.swhid);
     } else {
       cookingUrl = Urls.api_1_vault_cook_git_bare(recookTask.swhid);
     }
     if (recookTask.email) {
       cookingUrl += '?email=' + recookTask.email;
     }
     try {
     // request archive cooking
       const response = await csrfPost(cookingUrl);
       handleFetchError(response);
 
       // update task status
       recookTask.status = 'new';
       const vaultCookingTasks = JSON.parse(localStorage.getItem('swh-vault-cooking-tasks'));
       for (let i = 0; i < vaultCookingTasks.length; ++i) {
         if (vaultCookingTasks[i].swhid === recookTask.swhid) {
           vaultCookingTasks[i] = recookTask;
           break;
         }
       }
       // save updated tasks to local storage
       localStorage.setItem('swh-vault-cooking-tasks', JSON.stringify(vaultCookingTasks));
       // hide recook archive modal
       $('#vault-recook-object-modal').modal('hide');
       // restart cooking tasks status polling
       await checkVaultCookingTasks();
     } catch (_) {
       // something went wrong
       $('#vault-recook-object-modal').modal('hide');
       await checkVaultCookingTasks();
     }
   }
 }
 
 async function checkVaultCookingTasks() {
   const vaultCookingTasks = JSON.parse(localStorage.getItem('swh-vault-cooking-tasks'));
   if (!vaultCookingTasks || vaultCookingTasks.length === 0) {
     $('.swh-vault-table tbody tr').remove();
     checkVaultId = setTimeout(checkVaultCookingTasks, pollingInterval);
     return;
   }
   const cookingTaskRequests = [];
   const tasks = {};
   const currentObjectIds = [];
 
   for (let i = 0; i < vaultCookingTasks.length; ++i) {
     const cookingTask = vaultCookingTasks[i];
 
     if (typeof cookingTask.object_type !== 'undefined') {
       // Legacy cooking task, upgrade it to the new schema
       if (cookingTask.object_type === 'directory') {
         cookingTask.swhid = `swh:1:dir:${cookingTask.object_id}`;
         cookingTask.bundle_type = 'flat';
         cookingTask.fetch_url = Urls.api_1_vault_fetch_flat(cookingTask.swhid);
       } else if (cookingTask.object_type === 'revision') {
         cookingTask.swhid = `swh:1:rev:${cookingTask.object_id}`;
         cookingTask.bundle_type = 'git_bare';
         cookingTask.fetch_url = Urls.api_1_vault_fetch_git_bare(cookingTask.swhid);
       } else {
         // Log to the console + Sentry
         console.error(`Unexpected cookingTask.object_type: ${cookingTask.object_type}`);
         // Ignore it for now and hope a future version will fix it
         continue;
       }
       delete cookingTask.object_type;
       delete cookingTask.object_id;
     }
 
     currentObjectIds.push(cookingTask.swhid);
     tasks[cookingTask.swhid] = cookingTask;
     let cookingUrl;
     if (cookingTask.bundle_type === 'flat') {
       cookingUrl = Urls.api_1_vault_cook_flat(cookingTask.swhid);
     } else {
       cookingUrl = Urls.api_1_vault_cook_git_bare(cookingTask.swhid);
     }
     if (cookingTask.status !== 'done' && cookingTask.status !== 'failed') {
       cookingTaskRequests.push(fetch(cookingUrl));
     }
   }
   $('.swh-vault-table tbody tr').each((i, row) => {
     const swhid = $(row).find('.vault-object-info').data('swhid');
     if ($.inArray(swhid, currentObjectIds) === -1) {
       $(row).remove();
     }
   });
   try {
     const responses = await Promise.all(cookingTaskRequests);
     handleFetchErrors(responses);
     const cookingTasks = await Promise.all(responses.map(r => r.json()));
 
     const table = $('#vault-cooking-tasks tbody');
     for (let i = 0; i < cookingTasks.length; ++i) {
       const cookingTask = tasks[cookingTasks[i].swhid];
       cookingTask.status = cookingTasks[i].status;
       cookingTask.fetch_url = cookingTasks[i].fetch_url;
       cookingTask.progress_message = cookingTasks[i].progress_message;
     }
     for (let i = 0; i < vaultCookingTasks.length; ++i) {
       const cookingTask = vaultCookingTasks[i];
       const rowTask = $(`#vault-task-${CSS.escape(cookingTask.swhid)}`);
 
       if (!rowTask.length) {
 
         let browseUrl = cookingTask.browse_url;
         if (!browseUrl) {
           browseUrl = Urls.browse_swhid(cookingTask.swhid);
         }
 
         const progressBar = $.parseHTML(progress)[0];
         const progressBarContent = $(progressBar).find('.progress-bar');
         updateProgressBar(progressBarContent, cookingTask);
         table.prepend(vaultTableRowTemplate({
           browseUrl: browseUrl,
           cookingTask: cookingTask,
           progressBar: progressBar,
           Urls: Urls,
           swh: swh
         }));
       } else {
         const progressBar = rowTask.find('.progress-bar');
         updateProgressBar(progressBar, cookingTask);
         const downloadLink = rowTask.find('.vault-dl-link');
         if (cookingTask.status === 'done') {
           downloadLink[0].innerHTML =
               '<button class="btn btn-default btn-sm" ' +
               `onclick="swh.vault.fetchCookedObject('${cookingTask.fetch_url}')">` +
               '<i class="mdi mdi-download mdi-fw" aria-hidden="true"></i>Download</button>';
         } else {
           downloadLink[0].innerHTML = '';
         }
       }
     }
     localStorage.setItem('swh-vault-cooking-tasks', JSON.stringify(vaultCookingTasks));
     checkVaultId = setTimeout(checkVaultCookingTasks, pollingInterval);
 
   } catch (error) {
     console.log('Error when fetching vault cooking tasks:', error);
   }
 }
 
 export function removeCookingTaskInfo(tasksToRemove) {
   let vaultCookingTasks = JSON.parse(localStorage.getItem('swh-vault-cooking-tasks'));
   if (!vaultCookingTasks) {
     return;
   }
   vaultCookingTasks = $.grep(vaultCookingTasks, task => {
     return $.inArray(task.swhid, tasksToRemove) === -1;
   });
   localStorage.setItem('swh-vault-cooking-tasks', JSON.stringify(vaultCookingTasks));
 }
 
 export function initUi() {
 
   $('#vault-tasks-toggle-selection').change(event => {
     $('.vault-task-toggle-selection').prop('checked', event.currentTarget.checked);
   });
 
   $('#vault-remove-tasks').click(() => {
     clearTimeout(checkVaultId);
     const tasksToRemove = [];
     $('.swh-vault-table tbody tr').each((i, row) => {
       const taskSelected = $(row).find('.vault-task-toggle-selection').prop('checked');
       if (taskSelected) {
         const swhid = $(row).find('.vault-object-info').data('swhid');
         tasksToRemove.push(swhid);
         $(row).remove();
       }
     });
     removeCookingTaskInfo(tasksToRemove);
     $('#vault-tasks-toggle-selection').prop('checked', false);
     checkVaultId = setTimeout(checkVaultCookingTasks, pollingInterval);
   });
 
   checkVaultCookingTasks();
 
   window.onfocus = () => {
     clearTimeout(checkVaultId);
     checkVaultCookingTasks();
   };
 
 }