Comment 2 for bug 863039

There are some more strings that need plurals, namely the "X minutes/hours/days ago" strings in the main window. The file containing these is missing from POTFILES.in too. Proposed branch fixes all of this. I also changed the time limit of the "a few seconds ago" string, because IMHO between 30 and 60 seconds, the "0 minutes ago" string would look funny. Before, this case was considered "1 minute ago", I hope this is not a problem.