New feature that notifies a user when their group invite is accepted. (#8244)

* New notification feature that notifies a user when their group invite is accepted. fixes #7788

* Updating to a modal instead of a popup notification

* Making a generic modal template and using it for notifications of group invitation acceptance.

* Working with paglias's comments for doing translation server side.

* Final changes based on pr comments.

test/api/v3/integration/groups/POST-groups_groupId_join.test.js

@@ -134,6 +134,22 @@ describe('POST /group/:groupId/join', () => {
 
         await expect(user.get('/user')).to.eventually.have.deep.property('items.quests.basilist', 1);
       });
+
+      it('notifies inviting user that their invitation was accepted', async () => {
+        await invitedUser.post(`/groups/${guild._id}/join`);
+
+        let inviter = await user.get('/user');
+        let expectedData = {
+          headerText: t('invitationAcceptedHeader'),
+          bodyText: t('invitationAcceptedBody', {
+            username: invitedUser.auth.local.username,
+            groupName: guild.name,
+          }),
+        };
+
+        expect(inviter.notifications[0].type).to.eql('GROUP_INVITE_ACCEPTED');
+        expect(inviter.notifications[0].data).to.eql(expectedData);
+      });
     });
   });
 
@@ -172,6 +188,23 @@ describe('POST /group/:groupId/join', () => {
         await expect(invitedUser.get('/user')).to.eventually.have.deep.property('party._id', party._id);
       });
 
+      it('notifies inviting user that their invitation was accepted', async () => {
+        await invitedUser.post(`/groups/${party._id}/join`);
+
+        let inviter = await user.get('/user');
+
+        let expectedData = {
+          headerText: t('invitationAcceptedHeader'),
+          bodyText: t('invitationAcceptedBody', {
+            username: invitedUser.auth.local.username,
+            groupName: party.name,
+          }),
+        };
+
+        expect(inviter.notifications[0].type).to.eql('GROUP_INVITE_ACCEPTED');
+        expect(inviter.notifications[0].data).to.eql(expectedData);
+      });
+
       it('clears invitation from user when joining party', async () => {
         await invitedUser.post(`/groups/${party._id}/join`);