This line doesn't get picked up (`rake locale:find; git diff locale/foreman.pot`), and it would only get associated with the first one.  You're going to need to repeat yourself unfortunately and use some contortions to make it show up:

    <th><span class="small" title="" data-original-title="<%=_('Restarted')%>">
      <%= # TRANSLATORS: report events, first letter of "Restarted"
        _("R") %></span></th>