py3: convert the mode argument of os.fdopen to unicodes
Couple of these from the earlier series got lost while rebasing. So this patch
converts them again.
<tr>
<td class="age">{date|rfc822date}</td>
<td class="author">{author|person}</td>
<td class="description">
<a href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}">{desc|strip|firstline|escape|nonempty}</a>
{inbranch%changelogbranchname}{branches%changelogbranchhead}{tags%changelogtag}{bookmarks%changelogtag}{rename%filelogrename}
</td>
</tr>