[IMP] web: customize the save/close button of a FormViewDialog

Purpose
=======
In Social, we want to be able to change the "Save" button into a "Add"
button when we add a new stream. For that purpose, we need to be able to
customize the text of the `FormViewDialog` buttons.

Task-2234580
See odoo/enterprise/pull/9933

closes odoo/odoo#49622

Related: odoo/enterprise#9933
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/web/static/src/js/views/view_dialogs.js

@@ -110,7 +110,7 @@ var FormViewDialog = ViewDialog.extend({
 
         if (!options.buttons) {
             options.buttons = [{
-                text: (readonly ? _t("Close") : _t("Discard")),
+                text: options.close_text || (readonly ? _t("Close") : _t("Discard")),
                 classes: "btn-secondary o_form_button_cancel",
                 close: true,
                 click: function () {
@@ -124,7 +124,7 @@ var FormViewDialog = ViewDialog.extend({
 
             if (!readonly) {
                 options.buttons.unshift({
-                    text: (multi_select ? _t("Save & Close") : _t("Save")),
+                    text: options.save_text || (multi_select ? _t("Save & Close") : _t("Save")),
                     classes: "btn-primary",
                     click: function () {
                         self._save().then(self.close.bind(self));