Add sublabels and nonfunctional add-another button

src/registrar/templates/domain_nameservers.html

@@ -18,6 +18,7 @@
 	{{ formset.management_form }}
 
     {% for form in formset %}
+    {% with sublabel_text="Example: ns"|concat:forloop.counter|concat:".nameserver.com" %}
       {% if forloop.counter <= 2 %}
         {% with attr_required=True %}
           {% input_with_errors form.server %}
@@ -25,9 +26,17 @@
       {% else %}
         {% input_with_errors form.server %}
       {% endif %}
+    {% endwith %}
     {% endfor %}
 
-      <button
+    <button type="submit" name="submit_button" value="save" class="usa-button usa-button--unstyled display-block">
+      <svg class="usa-icon" aria-hidden="true" focusable="false" role="img" width="24" height="24">
+        <use xlink:href="{%static 'img/sprite.svg'%}#add_circle"></use>
+      </svg><span class="margin-left-05">Add another name server</span>
+    </button>
+
+
+    <button
           type="submit"
           class="usa-button"
       >Save</button>

src/registrar/templates/includes/input_with_errors.html

@@ -28,6 +28,10 @@ error messages, if necessary.
     {% include "django/forms/label.html" %}
   {% endif %}
 
+  {% if sublabel_text %}
+    <p id="{{ widget.attrs.id }}__sublabel" class="text-base">{{ sublabel_text }}</p>
+  {% endif %}
+
   {% if field.errors %}
     <div id="{{ widget.attrs.id }}__error-message">
     {% for error in field.errors %}
@@ -71,4 +75,4 @@ error messages, if necessary.
   </span>
 
 </div>
-{% endif %}
+{% endif %}

src/registrar/templatetags/__init__.py

@@ -6,3 +6,8 @@ from django.template.defaulttags import register
 @register.filter
 def get_item(dictionary, key):
     return dictionary.get(key)
+
+@register.filter
+def concat(arg1, arg2):
+    """concatenate arg1 & arg2"""
+    return str(arg1) + str(arg2)