Move into nested docroot

web/core/modules/language/templates/language-content-settings-table.html.twig

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+{#
+/**
+ * @file
+ * Default theme implementation to display a language content settings table.
+ *
+ * Available variables:
+ * - title: The title of the table.
+ * - build: Table of content language settings.
+ *
+ * @see template_preprocess_language_content_settings_table()
+ *
+ * @ingroup themeable
+ */
+#}
+<h4>{{ title }}</h4>
+{{ build }}

web/core/modules/language/templates/language-negotiation-configure-form.html.twig

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+{#
+/**
+ * @file
+ * Default theme implementation for a language negotiation configuration form.
+ *
+ * Available variables:
+ * - language_types: A list of language negotiation types. Each language type
+ *   contains the following:
+ *   - type: The machine name for the negotiation type.
+ *   - title: The language negotiation type name.
+ *   - description: A description for how the language negotiation type
+ *     operates.
+ *   - configurable: A radio element to toggle the table.
+ *   - table: A draggable table for the language detection methods of this type.
+ *   - children: Remaining form items for the group.
+ *   - attributes: A list of HTML attributes for the wrapper element.
+ * - children: Remaining form items for all groups.
+ *
+ * @see template_preprocess_language_negotiation_configure_form()
+ *
+ * @ingroup themeable
+ */
+#}
+{% for language_type in language_types %}
+  {%
+    set language_classes = [
+      'js-form-item',
+      'form-item',
+      'table-language-group',
+      'table-' ~ language_type.type ~ '-wrapper',
+    ]
+  %}
+  <div{{ language_type.attributes.addClass(language_classes) }}>
+    <h2>{{ language_type.title }}</h2>
+    <div class="description">{{ language_type.description }}</div>
+    {{ language_type.configurable }}
+    {{ language_type.table }}
+    {{ language_type.children }}
+  </div>
+{% endfor %}
+{{ children }}