diff --git a/app/assets/javascripts/controllers/admin/calendar.coffee.erb b/app/assets/javascripts/controllers/admin/calendar.coffee.erb
index 31574c081..bb9764117 100644
--- a/app/assets/javascripts/controllers/admin/calendar.coffee.erb
+++ b/app/assets/javascripts/controllers/admin/calendar.coffee.erb
@@ -151,7 +151,7 @@ Application.Controllers.controller "AdminCalendarController", ["$scope", "$state
         resolve:
           object: ->
             title: _t('admin_calendar.confirmation_required')
-            msg: if locked then _t("admin_calendar.do_you_really_want_to_allow_reservations") else _t("admin_calendar.do_you_really_want_to_block_this_slot_html")
+            msg: if locked then _t("admin_calendar.do_you_really_want_to_allow_reservations") else _t("admin_calendar.do_you_really_want_to_block_this_slot")
       , ->
         # the admin has confirmed, lock/unlock the slot
         Availability.lock {id: $scope.availability.id}, {lock: !locked}
diff --git a/config/locales/app.admin.en.yml b/config/locales/app.admin.en.yml
index abfae4858..f26c9f1fe 100644
--- a/config/locales/app.admin.en.yml
+++ b/config/locales/app.admin.en.yml
@@ -48,6 +48,17 @@ en:
           unable_to_delete_the_slot_START-END_because_it_s_already_reserved_by_a_member: "Unable to delete the slot {{START}} - {{END}} because it's already reserved by a member"  # angular interpolation
           you_should_select_at_least_a_machine: "You should select at least one machine on this slot."
           export_is_running_you_ll_be_notified_when_its_ready: "Export is running. You'll be notified when it's ready."
+          actions: "Actions"
+          block_reservations: "Block reservations"
+          do_you_really_want_to_block_this_slot: "Do you really want to block new reservations on this slot? It will become invisible to users."
+          locking_success: "Slot successfully locked, it won't appear any longer in the user calendar"
+          locking_failed: "An error occurred. Slot locking has failed"
+          allow_reservations: "Allow reservations"
+          do_you_really_want_to_allow_reservations: "Do you really want to allow booking again on this slot? It will become visible for the users."
+          unlocking_success: "Slot successfully unlocked, it will appear again in the user calendar"
+          unlocking_failed: "An error occurred. Slot unlocking has failed"
+          reservations_locked: "Booking is blocked"
+          unlockable_because_reservations: "Unable to block booking on this slot because some uncancelled reservations exist on it."
 
       project_elements:
         # management of the projects' components
diff --git a/config/locales/app.admin.fr.yml b/config/locales/app.admin.fr.yml
index 5c6bd48aa..49fe46df4 100644
--- a/config/locales/app.admin.fr.yml
+++ b/config/locales/app.admin.fr.yml
@@ -50,7 +50,7 @@ fr:
           export_is_running_you_ll_be_notified_when_its_ready: "L'export est en cours. Vous serez notifié lorsqu'il sera prêt."
           actions: "Actions"
           block_reservations: "Bloquer les réservations"
-          do_you_really_want_to_block_this_slot_html: "Êtes vous sur de vouloir bloquer les nouvelles réservations sur ce créneau ? Il deviendra alors invisible pour les utilisateurs. <br/><strong>Attention</strong> : cela n'annulera pas les réservations existantes."
+          do_you_really_want_to_block_this_slot: "Êtes vous sur de vouloir bloquer les nouvelles réservations sur ce créneau ? Il deviendra alors invisible pour les utilisateurs."
           locking_success: "Le créneau a bien été verrouillé, il n'apparaitra plus dans le calendrier utilisateur"
           locking_failed: "Une erreur est survenue. Le verrouillage du créneau a échoué"
           allow_reservations: "Autoriser les réservations"
diff --git a/config/locales/app.admin.pt.yml b/config/locales/app.admin.pt.yml
index 5eebc6d9a..0938b9c0e 100755
--- a/config/locales/app.admin.pt.yml
+++ b/config/locales/app.admin.pt.yml
@@ -48,6 +48,17 @@ pt:
           unable_to_delete_the_slot_START-END_because_it_s_already_reserved_by_a_member: "Não é possível deletar o slot {{START}} - {{END}} porque já foi reservado por um membro"  # angular interpolation
           you_should_select_at_least_a_machine: "Você deveria selecionar a última máquina neste slot."
           export_is_running_you_ll_be_notified_when_its_ready: "A Exportação está em andamento. Você será notificado quando terminar."
+          actions: "Ações"
+          block_reservations: "Impedir reservas"
+          do_you_really_want_to_block_this_slot: "Você realmente quer bloquear novas reservas neste slot? Isso se tornará invisível para os usuários."
+          locking_success: "Slot bloqueado com êxito, ela não aparecerá mais tempo no calendário do usuário"
+          locking_failed: "Um erro ocorreu. O bloqueio do slot falhou"
+          allow_reservations: "Permitir a reserva"
+          do_you_really_want_to_allow_reservations: "Você realmente quer permitir a reserva novamente neste slot? Será visível para os usuários."
+          unlocking_success: "Slot desbloqueado com sucesso, ele aparecerá novamente no calendário do usuário"
+          unlocking_failed: "Um erro ocorreu. O desbloqueio do slot falhou"
+          reservations_locked: "Reserva é bloqueado"
+          unlockable_because_reservations: "Não é possível bloquear a reserva neste slot porque existem algumas reservas não cancelados nele."
 
       project_elements:
         # management of the projects' components