remove reason:

app/javascript/submission_form/area.vue

@@ -74,7 +74,7 @@
           ID: {{ signature.uuid }}
         </div>
         <div>
-          {{ t('reason') }}: {{ values[field.preferences?.reason_field_uuid] || t('digitally_signed_by') }} {{ submitter.name }}
+          <span v-if="values[field.preferences?.reason_field_uuid]">{{ t('reason') }}: </span>{{ values[field.preferences?.reason_field_uuid] || t('digitally_signed_by') }} {{ submitter.name }}
           <template v-if="submitter.email">
             &lt;{{ submitter.email }}&gt;
           </template>

app/views/submissions/_value.html.erb

@@ -12,7 +12,8 @@
             ID: <%= attachment.uuid %>
           </div>
           <div>
-            <%= t('reason') %>: <%= submitter.values[field.dig('preferences', 'reason_field_uuid')].presence || t('digitally_signed_by') %> <%= submitter.name %>
+            <% reason_value = submitter.values[field.dig('preferences', 'reason_field_uuid')].presence %>
+            <% if reason_value %><%= t('reason') %>: <% end %><%= reason_value || t('digitally_signed_by') %> <%= submitter.name %>
             <% if submitter.email %>
               &lt;<%= submitter.email %>&gt;
             <% end %>

lib/submissions/generate_result_attachments.rb

@@ -236,7 +236,7 @@ module Submissions
 
             reason_string =
               I18n.with_locale(submitter.account.locale) do
-                "#{I18n.t('reason')}: #{reason_value || I18n.t('digitally_signed_by')} " \
+                "#{reason_value ? "#{I18n.t('reason')}: " : ''}#{reason_value || I18n.t('digitally_signed_by')} " \
                   "#{submitter.name}#{submitter.email.present? ? " <#{submitter.email}>" : ''}\n" \
                   "#{I18n.l(attachment.created_at.in_time_zone(submitter.account.timezone), format: :long)} " \
                   "#{TimeUtils.timezone_abbr(submitter.account.timezone, attachment.created_at)}"