Messages to completions conversion

app/views/completions/_form.html.slim

@@ -1,9 +1,21 @@
 = form_with model: completion, url: url, method: method do |form|
+  - if @message
+    .row.mb-3
+      .col
+        h4 = t("messages.singular").capitalize
+        .alert.alert-secondary
+          b
+            = @message.author
+          br
+          = @message.text
+    .row
+      .col
+        h4 = t("completions.singular").capitalize
   .row.mb-3
     .col
       .form-floating
-        = form.text_field :time_seconds, autocomplete: "off", class: "form-control"
-        = form.label :time_seconds, class: "required"
+        = form.text_field :display_time_from_start, autocomplete: "off", class: "form-control"
+        = form.label :display_time_from_start, class: "required"
   .row.mb-3
     .col
       .form-floating