fix: i18n string error (#4844)

app/views/feed/add.phtml

@@ -59,10 +59,6 @@
 					</option>
 					<?php } ?>
 				</select>
-
-				<span aria-hidden="true">
-					<input type="text" name="new_category[name]" id="new_category_name" autocomplete="off" placeholder="<?= _t('sub.category.new') ?>" />
-				</span>
 			</div>
 		</div>