diff --git a/app/assets/javascripts/controllers/events.coffee.erb b/app/assets/javascripts/controllers/events.coffee.erb
index 528d94344..33a267fd7 100644
--- a/app/assets/javascripts/controllers/events.coffee.erb
+++ b/app/assets/javascripts/controllers/events.coffee.erb
@@ -542,12 +542,11 @@ Application.Controllers.controller "ShowEventController", ["$scope", "$state", "
         $scope.numberFilter = $filter('number')
 
         # Button label
-        confirmPaymentText = if $scope.currentUser.role == 'admin' then _t('confirm_client_payment_of_') else _t('confirm_my_payment_of_')
         if $scope.amount > 0
-          $scope.validButtonName = "#{confirmPaymentText} #{$filter('currency')($scope.amount)}"
+          $scope.validButtonName = _t('confirm_payment_of_html', {ROLE:$scope.currentUser.role, AMOUNT:$filter('currency')($scope.amount)}, "messageformat")
         else
           if price.price > 0 and $scope.walletAmount == 0
-            $scope.validButtonName = "#{confirmPaymentText} #{$filter('currency')(price.price)}"
+            $scope.validButtonName = _t('confirm_payment_of_html', {ROLE:$scope.currentUser.role, AMOUNT:$filter('currency')(price.price)}, "messageformat")
           else
             $scope.validButtonName = _t('confirm')
 
diff --git a/app/assets/javascripts/controllers/machines.coffee.erb b/app/assets/javascripts/controllers/machines.coffee.erb
index d3092b06e..98f2c8009 100644
--- a/app/assets/javascripts/controllers/machines.coffee.erb
+++ b/app/assets/javascripts/controllers/machines.coffee.erb
@@ -831,12 +831,11 @@ Application.Controllers.controller "ReserveMachineController", ["$scope", "$stat
         $scope.numberFilter = $filter('number')
 
         # Button label
-        confirmPaymentText = if $scope.currentUser.role == 'admin' then _t('confirm_client_payment_of_') else _t('confirm_my_payment_of_')
         if $scope.amount > 0
-          $scope.validButtonName = "#{confirmPaymentText} #{$filter('currency')($scope.amount)}"
+          $scope.validButtonName = _t('confirm_payment_of_html', {ROLE:$scope.currentUser.role, AMOUNT:$filter('currency')($scope.amount)}, "messageformat")
         else
           if price.price > 0 and $scope.walletAmount == 0
-            $scope.validButtonName = "#{confirmPaymentText} #{$filter('currency')(price.price)}"
+            $scope.validButtonName = _t('confirm_payment_of_html', {ROLE:$scope.currentUser.role, AMOUNT:$filter('currency')(price.price)}, "messageformat")
           else
             $scope.validButtonName = _t('confirm')
 
diff --git a/app/assets/javascripts/controllers/plans.coffee.erb b/app/assets/javascripts/controllers/plans.coffee.erb
index 815a8fe8a..ba7456780 100644
--- a/app/assets/javascripts/controllers/plans.coffee.erb
+++ b/app/assets/javascripts/controllers/plans.coffee.erb
@@ -236,12 +236,11 @@ Application.Controllers.controller "PlansIndexController", ["$scope", "$rootScop
           $scope.member = member
 
           # Button label
-          confirmPaymentText = if $scope.currentUser.role == 'admin' then _t('confirm_client_payment_of_') else _t('confirm_my_payment_of_')
           if $scope.amount > 0
-            $scope.validButtonName = "#{confirmPaymentText} #{$filter('currency')($scope.amount)}"
+            $scope.validButtonName = _t('confirm_payment_of_html', {ROLE:$scope.currentUser.role, AMOUNT:$filter('currency')($scope.amount)}, "messageformat")
           else
             if price.price > 0 and $scope.walletAmount == 0
-              $scope.validButtonName = "#{confirmPaymentText} #{$filter('currency')(price.price)}"
+              $scope.validButtonName = _t('confirm_payment_of_html', {ROLE:$scope.currentUser.role, AMOUNT:$filter('currency')(price.price)}, "messageformat")
             else
               $scope.validButtonName = _t('confirm')
 
diff --git a/app/assets/javascripts/controllers/trainings.coffee.erb b/app/assets/javascripts/controllers/trainings.coffee.erb
index 8fb8de80d..e5376ea91 100644
--- a/app/assets/javascripts/controllers/trainings.coffee.erb
+++ b/app/assets/javascripts/controllers/trainings.coffee.erb
@@ -556,12 +556,11 @@ Application.Controllers.controller "ReserveTrainingController", ["$scope", "$sta
         $scope.numberFilter = $filter('number')
 
         # Button label
-        confirmPaymentText = if $scope.currentUser.role == 'admin' then _t('confirm_client_payment_of_') else _t('confirm_my_payment_of_')
         if $scope.amount > 0
-          $scope.validButtonName = "#{confirmPaymentText} #{$filter('currency')($scope.amount)}"
+          $scope.validButtonName = _t('confirm_payment_of_html', {ROLE:$scope.currentUser.role, AMOUNT:$filter('currency')($scope.amount)}, "messageformat")
         else
           if price.price > 0 and $scope.walletAmount == 0
-            $scope.validButtonName = "#{confirmPaymentText} #{$filter('currency')(price.price)}"
+            $scope.validButtonName = _t('confirm_payment_of_html', {ROLE:$scope.currentUser.role, AMOUNT:$filter('currency')(price.price)}, "messageformat")
           else
             $scope.validButtonName = _t('confirm')
 
diff --git a/app/assets/templates/plans/payment_modal.html.erb b/app/assets/templates/plans/payment_modal.html.erb
index 60d198d2c..2e723bd9c 100644
--- a/app/assets/templates/plans/payment_modal.html.erb
+++ b/app/assets/templates/plans/payment_modal.html.erb
@@ -9,6 +9,6 @@
   <p>{{ plan | humanReadablePlanName }}</p>
 </div>
 <div class="modal-footer">
-  <button class="btn btn-info" ng-click="ok()" ng-disabled="attempting">{{validButtonName}}</button>
+  <button class="btn btn-info" ng-click="ok()" ng-disabled="attempting" ng-bind-html="validButtonName"></button>
   <button class="btn btn-default" ng-click="cancel()" translate>{{ 'cancel' }}</button>
 </div>
diff --git a/config/locales/app.shared.en.yml b/config/locales/app.shared.en.yml
index 722db6aa0..4a9f40174 100644
--- a/config/locales/app.shared.en.yml
+++ b/config/locales/app.shared.en.yml
@@ -96,6 +96,7 @@ en:
         name_is_required: "Name is required."
         all_themes: "All themes"
         filter: 'Filter'
+        confirm_payment_of_html: "{ROLE, select, admin{Payment on site} other{Pay}}: {AMOUNT}"  # messageFormat interpolation (context: confirm my payment of $20.00)
 
       messages:
         you_will_lose_any_unsaved_modification_if_you_quit_this_page: "You will lose any unsaved modification if you quit this page"
@@ -159,7 +160,6 @@ en:
         i_have_read_and_accept_: "I have read, and accept"
         _the_general_terms_and_conditions: "the general terms and conditions."
         enter_your_card_number: "Enter your card number"
-        confirm_my_payment_of_: "Confirm my payment of"  # context: confirm my payment of $20.00
         credit_amount_for_pay_reservation: "{{amount}} {{currency}} remains to be paid to confirm your reservation"
         client_credit_amount_for_pay_reservation: "{{amount}} {{currency}} remains to be paid to confirm reservation of client"
 
@@ -167,7 +167,6 @@ en:
         # dialog of on site payment for reservations
         booking_confirmation: "Booking confirmation"
         here_is_the_summary_of_the_slots_to_book_for_the_current_user: "Here is the summary of the slots to book for the current user:"
-        confirm_client_payment_of_: "Confirm (Payment on site) of {{amount}} {{currency}}"
 
       event:
         # event edition form
diff --git a/config/locales/app.shared.fr.yml b/config/locales/app.shared.fr.yml
index a157a6fdb..119deb195 100644
--- a/config/locales/app.shared.fr.yml
+++ b/config/locales/app.shared.fr.yml
@@ -96,6 +96,7 @@ fr:
         name_is_required: "Le nom est requis."
         all_themes: "Toutes les thématiques"
         filter: 'Filtre'
+        confirm_payment_of_html: "{ROLE, select, admin{Paiement sur place} other{Payer}} : {AMOUNT}"  # messageFormat interpolation (contexte : valider mon paiement de 20,00 €)
 
       messages:
         you_will_lose_any_unsaved_modification_if_you_quit_this_page: "Vous perdrez les modifications non enregistrées si vous quittez cette page"
@@ -159,7 +160,6 @@ fr:
         i_have_read_and_accept_: "J'ai bien pris connaissance, et accepte"
         _the_general_terms_and_conditions: "les conditions générales de vente."
         enter_your_card_number: "Saisissez votre numéro de carte"
-        confirm_my_payment_of_: "Valider mon paiement de"  # contexte : valider mon paiement de 20,00 €
         credit_amount_for_pay_reservation: "Il vous reste {{amount}} {{currency}} à payer pour valider votre réservation"
         client_credit_amount_for_pay_reservation: "Il reste {{amount}} {{currency}} à payer pour valider la réservation"
 
@@ -167,7 +167,6 @@ fr:
         # fenêtre de paiement sur place d'une réservation
         booking_confirmation: "Validation réservation"
         here_is_the_summary_of_the_slots_to_book_for_the_current_user: "Voici le récapitulatif des créneaux à réserver pour l'utilisateur courant :"
-        confirm_client_payment_of_: "Valider (Paiement sur place) de {{amount}} {{currency}}"
 
       event:
         # formulaire d'édition d'un événement