diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2578f7226..abcb0b091 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 - Interface to manage partners
 - Ability to define, per availability, a custom duration for the reservation slots
+- Corrected the documentation about BOOK_SLOT_AT_SAME_TIME
 - Fix a bug: unable to change group if the previous was deactivated
 - Fix a bug: unable to create events or trainings that are not multiples of SLOT_DURATION
 - Fix a bug: unable to delete an unreserved event
diff --git a/app/assets/javascripts/controllers/home.js b/app/assets/javascripts/controllers/home.js
index 1d961ae00..a70f9ccf0 100644
--- a/app/assets/javascripts/controllers/home.js
+++ b/app/assets/javascripts/controllers/home.js
@@ -1,7 +1,7 @@
 'use strict';
 
-Application.Controllers.controller('HomeController', ['$scope', '$stateParams', 'settingsPromise', 'Member', 'uiTourService', '_t', 'Help',
-  function ($scope, $stateParams, settingsPromise, Member, uiTourService, _t, Help) {
+Application.Controllers.controller('HomeController', ['$scope', '$stateParams', '$translatePartialLoader', 'AuthService', 'settingsPromise', 'Member', 'uiTourService', '_t', 'Help',
+  function ($scope, $stateParams, $translatePartialLoader, AuthService, settingsPromise, Member, uiTourService, _t, Help) {
   /* PUBLIC SCOPE */
 
     // Home page HTML content
@@ -21,8 +21,10 @@ Application.Controllers.controller('HomeController', ['$scope', '$stateParams',
      * This is intended as a contextual help (when pressing F1)
      */
     $scope.setupHomeTour = function () {
-      if ($scope.currentUser && $scope.currentUser.role === 'admin') {
-        setupWelcomeTour();
+      if (AuthService.isAuthorized(['admin', 'manager'])) {
+        // this is an ugly hack, but we can't do better for now because angular-ui-tour does not support removing steps
+        // and we can't use promises with _t's translations (needs a very big refactoring)
+        setTimeout(setupWelcomeTour, 1000);
       }
     };
 
@@ -271,14 +273,16 @@ Application.Controllers.controller('HomeController', ['$scope', '$stateParams',
         placement: 'bottom',
         orphan: 'true'
       });
-      uitour.createStep({
-        selector: '.app-generator .app-version',
-        stepId: 'version',
-        order: 19,
-        title: _t('app.public.tour.welcome.version.title'),
-        content: _t('app.public.tour.welcome.version.content'),
-        placement: 'top'
-      });
+      if (AuthService.isAuthorized('admin')) {
+        uitour.createStep({
+          selector: '.app-generator .app-version',
+          stepId: 'version',
+          order: 19,
+          title: _t('app.public.tour.welcome.version.title'),
+          content: _t('app.public.tour.welcome.version.content'),
+          placement: 'top'
+        });
+      }
       uitour.createStep({
         selector: 'body',
         stepId: 'conclusion',
diff --git a/app/assets/javascripts/services/_t.js b/app/assets/javascripts/services/_t.js
index 2ea42f764..735f51e6f 100644
--- a/app/assets/javascripts/services/_t.js
+++ b/app/assets/javascripts/services/_t.js
@@ -1,9 +1,8 @@
 'use strict';
 
-Application.Services.factory('_t', ['$filter', function ($filter) {
-  return function (key, interpolation, options) {
-    if (interpolation == null) { interpolation = undefined; }
-    if (options == null) { options = undefined; }
-    return $filter('translate')(key, interpolation, options);
+Application.Services.factory('_t', ['$translate', function ($translate) {
+  return function (key, interpolations) {
+    if (interpolations == null) { interpolations = undefined; }
+    return $translate.instant(key, interpolations);
   };
 }]);
diff --git a/app/assets/javascripts/services/help.js.erb b/app/assets/javascripts/services/help.js.erb
index 344af4bde..1397422eb 100644
--- a/app/assets/javascripts/services/help.js.erb
+++ b/app/assets/javascripts/services/help.js.erb
@@ -1,6 +1,7 @@
 'use strict';
 
-Application.Services.factory('Help', ['$rootScope', '$uibModal', '$state', function ($rootScope, $uibModal, $state) {
+Application.Services.factory('Help', ['$rootScope', '$uibModal', '$state', 'AuthService',
+  function ($rootScope, $uibModal, $state, AuthService) {
   const TOURS = {
     'app.public.home': 'welcome',
     'app.public.machines_list': 'machines',
@@ -19,7 +20,7 @@ Application.Services.factory('Help', ['$rootScope', '$uibModal', '$state', funct
 
 
   return function (e) {
-    if (!$rootScope.currentUser || $rootScope.currentUser.role !== 'admin') return;
+    if (!AuthService.isAuthorized(['admin', 'manager'])) return;
 
     if (e.key === 'F1') {
       e.preventDefault();
diff --git a/doc/environment.md b/doc/environment.md
index 61cd1ca81..90d713044 100644
--- a/doc/environment.md
+++ b/doc/environment.md
@@ -121,7 +121,7 @@ If set to 'false' the phone number won't be required to register a new user on t
 
     BOOK_SLOT_AT_SAME_TIME
 
-If set to 'false', users won't be able to book a machine/formation/event slot if they already have a reservation the same day at the same time.
+If set to 'true', users will be able to book a machine/formation/event slot, even if they already have a reservation the same day at the same time.
 <a name="USER_CONFIRMATION_NEEDED_TO_SIGN_IN"></a>
 
     USER_CONFIRMATION_NEEDED_TO_SIGN_IN