Add optional label to text, options, phone, and multi-checkbox inputs

Use new optional attribute on fields that are optional
Update styling to fit optional label and update translations

templates/components/options_input.html

@@ -28,6 +28,10 @@
           <legend>
             <div class="usa-input__title{% if not field.description %}-inline{% endif %}">
               {{ field.label | striptags}}
+              {% if optional %}
+                &nbsp;
+                <span class="usa-input-label-helper">(optional)</span>
+              {% endif %}
               {% if tooltip %}{{ Tooltip(tooltip) }}{% endif %}
             </div>