I can confirm this overlapping. It appears also in the german localization (my specs are listened in #272 ). In my opinion the used font in the windows steam client is a little bit smaller than the one in the linux client.
The latest client beta, from 11/5, moves things around.
Nothing extracted yet.
The text remaining download time... seconds overlaps with VIEW DETAILS.
OS: Ubuntu 12.04
Steam: Dec 19 2012, at 14:14:29
Steam API: v012