[IMP] mail: follower name in confirmation dialog on unfollow

Also fixing test so that it uses an existing follower.

Task-ID 1919551

closes odoo/odoo#31139

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

addons/mail/static/src/js/followers.js

@@ -248,8 +248,10 @@ var Followers = AbstractField.extend({
     _unfollow: function (ids) {
         var self = this;
         return new Promise(function (resolve, reject) {
-            var text = _t("Warning! \n If you remove a follower, he won't be notified of any email or discussion on this document.\n Do you really want to remove this follower ?");
+            var follower = _.find(self.followers, { res_id: ids.partner_ids ? ids.partner_ids[0] : ids.channel_ids[0] });
+            var text = _.str.sprintf(_t("If you remove a follower, he won't be notified of any email or discussion on this document. Do you really want to remove %s?"), follower.name);
             Dialog.confirm(this, text, {
+                title: _t("Warning"),
                 confirm_callback: function () {
                     var args = [
                         [self.res_id],

addons/mail/static/tests/chatter_tests.js

@@ -2085,7 +2085,7 @@ QUnit.test('followers widget: follow/unfollow, edit subtypes', async function (a
     assert.expect(24);
 
     var resID = 2;
-    var partnerID = 1;
+    var partnerID = 2;
     var followers = [];
     var nbReads = 0;
     var subtypes = [