Menu->Announcements

I can't add a new announcement there.
I seem to be able to edit something, but the window is broken: there's a strange 0 in the corner, and i can't save.

<img width="617" alt="screenshot 2018-02-22 16 40 18" src="https://user-images.githubusercontent.com/464519/36547966-5edeb1a2-17ef-11e8-8f27-8ed91039d64e.png">
