For https://en.wikipedia.org/wiki/Wikipedia_talk:AutoWikiBrowser/Feature_requests#Avoid_stretching_the_diff_area
Diff was previously fixed size 50/50 but changes after a long string (e.g. URL) could overflow
Add word-wrap: break-word; to force long strings to break, don't overflow

git-svn-id: svn://svn.code.sf.net/p/autowikibrowser/code/AWB@9890 5227b50d-9349-4574-b055-4b0a7525e11c