Translation:A catastrophe has occurred. Only thirty-five Klingons survive.
I'll repeat here in case someone comes looking here for the answer:
It seems to be some sort of screen size issue since the new design. Since this English sentence is pretty long, some of the words are running off the bottom of the window and no scroll bar is provided. If you know how to resize your screen, you can try that. When it happens to you, please take a screen shot and send it in a bug report: https://support.duolingo.com/hc/en-us/articles/204728264-How-do-I-report-a-bug-