Add support for required input validation

app/views/shared/_field.html.haml

@@ -15,14 +15,14 @@
     = form.label name, title, class: "control-label"
   .col-sm-10
     - if type == 'text'
-      = form.text_field name, class: "form-control", placeholder: placeholder
+      = form.text_field name, class: "form-control", placeholder: placeholder, required: required
     - elsif type == 'textarea'
-      = form.text_area name, rows: 5, class: "form-control", placeholder: placeholder
+      = form.text_area name, rows: 5, class: "form-control", placeholder: placeholder, required: required
     - elsif type == 'checkbox'
       = form.check_box name
     - elsif type == 'select'
       = form.select name, options_for_select(choices, value ? value : default_choice), {}, { class: "form-control" }
     - elsif type == 'password'
-      = form.password_field name, autocomplete: "new-password", class: "form-control"
+      = form.password_field name, autocomplete: "new-password", class: "form-control", required: value.present? ? nil : :required
     - if help
       %span.help-block= help