Description of problem:
In the html outputs, the dates in the revision history are right aligned, which IMHO makes them look mis-aligned since we read left to right.  

I think it looks okay for the author names to be right aligned since they are in the far right column.

The PDF is formatted as I would expect that the author names are left aligned as well.

Version-Release number of selected component (if applicable):
1.6.3

How reproducible:
everytime :-)

Steps to Reproduce:
1. create a book with items in revision history
2. view revision history

  
Actual results:
revision history headers are right aligned with the exception of the first

Expected results:
revision history headers are left aligned with the possible exception of the last


Additional info:
edited common.css 

.revhistory td {
        text-align:left;
        padding:0em;
        border: none;
        border-top: 1px solid #fff;
}

could leave this out entirely and have it match the PDF
.revhistory tr td:last-child {
        text-align:right;
}

The table cells also have alignment set, which is being overridden by CSS, <td align="left">