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diff --git a/web/core/modules/locale/locale.bulk.es6.js b/web/core/modules/locale/locale.bulk.es6.js
new file mode 100644
index 000000000..1d72a0bad
--- /dev/null
+++ b/web/core/modules/locale/locale.bulk.es6.js
@@ -0,0 +1,34 @@
+/**
+ * @file
+ * Locale behavior.
+ */
+
+(function ($, Drupal) {
+  /**
+   * Select the language code of an imported file based on its filename.
+   *
+   * This only works if the file name ends with "LANGCODE.po".
+   *
+   * @type {Drupal~behavior}
+   *
+   * @prop {Drupal~behaviorAttach} attach
+   *   Attaches behavior for preselecting language code based on filename.
+   */
+  Drupal.behaviors.importLanguageCodeSelector = {
+    attach(context, settings) {
+      const $form = $('#locale-translate-import-form').once('autodetect-lang');
+      if ($form.length) {
+        const $langcode = $form.find('.langcode-input');
+        $form.find('.file-import-input')
+          .on('change', function () {
+            // If the filename is fully the language code or the filename
+            // ends with a language code, pre-select that one.
+            const matches = $(this).val().match(/([^.][\.]*)([\w-]+)\.po$/);
+            if (matches && $langcode.find(`option[value="${matches[2]}"]`).length) {
+              $langcode.val(matches[2]);
+            }
+          });
+      }
+    },
+  };
+}(jQuery, Drupal));