fixed 'delete' label so it doesn't break translations

apps/files/templates/index.php

@@ -53,7 +53,7 @@
 				</span>
 			</th>
 			<th id="headerSize"><?php echo $l->t( 'Size' ); ?></th>
-			<th id="headerDate"><span id="modified"><?php echo $l->t( 'Modified' ); ?></span><span class="selectedActions"><a href="" class="delete"><?php echo $l->t('Delete all')?> <img class="svg" alt="<?php echo $l->t('Delete')?>" src="<?php echo OCP\image_path("core", "actions/delete.svg"); ?>" /></a></span></th>
+			<th id="headerDate"><span id="modified"><?php echo $l->t( 'Modified' ); ?></span><span class="selectedActions"><a href="" class="delete"><?php echo $l->t('Delete')?> <img class="svg" alt="<?php echo $l->t('Delete')?>" src="<?php echo OCP\image_path("core", "actions/delete.svg"); ?>" /></a></span></th>
 		</tr>
 	</thead>
 	<tbody id="fileList" data-readonly="<?php echo $_['readonly'];?>">