Use a capital letter where 'Required' is a separate sentence

common/static/common/templates/discussion/new-post.underscore

@@ -33,7 +33,7 @@
         <label class="field-label">
             <span class="field-label-text"><%- gettext("Title") %></span>
             <div class="field-help" id="field_help_title">
-                <%- gettext("Add a clear and descriptive title to encourage participation. (required)") %>
+                <%- gettext("Add a clear and descriptive title to encourage participation. (Required)") %>
             </div>
             <div>
                 <input aria-describedby="field_help_title" type="text" class="js-post-title field-input" name="title">

common/static/common/templates/discussion/thread-type.underscore

@@ -5,7 +5,7 @@
             <%- gettext("Post type") %>
         </span>
         <div class="field-help" id="field_help_post_type">
-            <%- gettext("Questions raise issues that need answers. Discussions share ideas and start conversations. (required)") %>
+            <%- gettext("Questions raise issues that need answers. Discussions share ideas and start conversations. (Required)") %>
         </div>
         <div class="field-label">
             <fieldset class="field-input">

common/static/common/templates/discussion/topic.underscore

@@ -4,7 +4,7 @@
             <%- gettext("Topic area") %>
         </span>
         <div class="field-help" id="field_help_topic_area">
-            <%- gettext("Add your post to a relevant topic to help others find it. (required)") %>
+            <%- gettext("Add your post to a relevant topic to help others find it. (Required)") %>
         </div>
         <div class="field-input">
             <select class="post-topic field-input" aria-describedby="field_help_topic_area" required>