add manual required inputs

templates/manual.html

@@ -25,7 +25,7 @@
     </script>
     {% endif %}
 
-    <label for="title">Title</label>
+    <label for="title">Title <span class="text-error">*</span></label>
     <input
       id="title"
       name="title"
@@ -45,7 +45,7 @@
       placeholder="The Lord of the Rings"
     />
 
-    <label for="author">Author(s)</label>
+    <label for="author">Author(s) <span class="text-error">*</span></label>
     <input
       id="author"
       name="author"