diff --git a/agaric/templates/elements/form-element-label.html.twig b/agaric/templates/elements/form-element-label.html.twig
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+++ b/agaric/templates/elements/form-element-label.html.twig
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+{#
+/**
+ * @file
+ * Default theme implementation for a form element label.
+ *
+ * Available variables:
+ * - element: an input element.
+ * - title: The label's text.
+ * - title_display: Elements title_display setting.
+ * - description: element description.
+ * - required: An indicator for whether the associated form element is required.
+ * - is_checkbox: Whether the label is outputted in checkbox context.
+ * - is_radio: Whether the label is outputted in radio button context.
+ * - attributes: A list of HTML attributes for the label.
+ *
+ * @ingroup templates
+ *
+ * @see template_preprocess_form_element_label()
+ */
+#}
+{%-
+  set classes = [
+    'form-label',
+    'label',
+    'control-label',
+    title_display == 'after' ? 'option',
+    title_display == 'invisible' and not (is_checkbox or is_radio) ? 'sr-only',
+    required ? 'js-form-required',
+    required ? 'form-required',
+    tag,
+    color,
+    size,
+  ]
+-%}
+{% if title is not empty and title_display == 'invisible' and (is_checkbox or is_radio) -%}
+  {#
+    Clear but preserve label text as attribute (e.g. for screen readers) for
+    checkboxes/radio buttons when it actually should be invisible.
+  #}
+  {%- set attributes = attributes.setAttribute('title', title) -%}
+  {%- set title = null -%}
+{%- endif -%}
+{#
+  Labels for single checkboxes/radios contain the element itself and thus have
+  always to be rendered regardless of whether they have a title or not.
+#}
+{%- if title is not empty or is_checkbox or is_radio -%}
+  <label{{ attributes.addClass(classes) }}>{{ element }}{{ title }}
+    {%- if description -%}
+      <p class="help-block">{{ description }}</p>
+    {%- endif -%}
+  </label>
+{%- endif -%}