Show participation in vote details

This is calculated by dividing the sum of all votes by the total number
of TUs (where the number of TUs is measured when the vote starts).

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

web/template/tu_details.php

@@ -34,6 +34,7 @@
 			<th><?= __("Abstain") ?></th>
 			<th><?= __("Total") ?></th>
 			<th><?= __('Voted') ?></th>
+			<th><?= __('Participation') ?></th>
 		</tr>
 		<tr>
 			<td><?= $row['Yes'] ?></td>
@@ -47,6 +48,11 @@
 				<span style="color: green; font-weight: bold"><?= __("Yes") ?></span>
 				<?php endif; ?>
 			</td>
+			<?php if ($row['ActiveTUs'] > 0): ?>
+			<td><?= number_format(($row['Yes'] + $row['No'] + $row['Abstain']) / $row['ActiveTUs'] * 100, 2) ?>%</td>
+			<?php else: ?>
+			<td><?= __("unknown") ?></td>
+			<?php endif; ?>
 		</tr>
 	</table>
 </div>