notify project owner when project is in waiting funds #changelog [Fix #427075]

When project is finished and going to waiting funds state we send a
notification for the project owner
Merge branch 'master' of github.com:catarse/catarse
adjust some notifications text [Fix #47818011]
just some adjusts on notification texts
solve conflicts
adjust some notifications text [Fix #47818011]
just some adjusts on notification texts
solved conflicts
added model and associations for channel subscriptions [#44717691]
Merge branch 'channels' of github.com:catarse/catarse into channels
Merge branch 'master' of github.com:catarse/catarse into channels