Since we've recently introduced a topic namespace, the notification looked like:
"Username thanked you for your comment in "Topic title" on Topic:UUID"
We want the board name instead of the link to the topic page, like:
"Username thanked you for your comment in "Topic title" on Talk:Boardname"
Change-Id: If45c01be3b0a9d67572932253a0103a2480fc823
The test suite sets up various mocks for Flow classes and inserts
them into Flow\Container, so the API module retrieves the correct
mock classes instead.
Change-Id: I9c5e910e288f3dd72c66e68ca558265b8ca8ce5e
