Break long words in a messagebox.

(It's not totally beautiful, though, in that it causes
your timestamp to appear in a weird place, but it's
better than the alternative.)

(imported from commit 217b6545330f7850f2892df2e82df18976463361)

zephyr/static/styles/zephyr.css

@@ -165,6 +165,7 @@ blockquote p {
     background-color: white;
     border: 1px solid gray;
     border-width: 0px 1px 1px 1px;
+    word-wrap: break-word;
 }
 
 .messagebox p {