diff --git a/core/modules/config_translation/src/FormElement/FormElementBase.php b/core/modules/config_translation/src/FormElement/FormElementBase.php
index 746ae1d..4418361 100644
--- a/core/modules/config_translation/src/FormElement/FormElementBase.php
+++ b/core/modules/config_translation/src/FormElement/FormElementBase.php
@@ -101,7 +101,8 @@ protected function getSourceElement(LanguageInterface $source_language, $source_
     return array(
       '#type' => 'item',
       '#title' => $this->t('@label <span class="visually-hidden">(@source_language)</span>', array(
-        '@label' => $this->definition->getLabel(),
+        // Labels originate from configuration schema and are translatable.
+        '@label' => $this->t($this->definition->getLabel()),
         '@source_language' => $source_language->getName(),
       )),
       '#markup' => $value,
@@ -163,7 +164,8 @@ protected function getTranslationElement(LanguageInterface $translation_language
     // Add basic properties that apply to all form elements.
     return array(
       '#title' => $this->t('@label <span class="visually-hidden">(@source_language)</span>', array(
-        '@label' => $this->definition['label'],
+        // Labels originate from configuration schema and are translatable.
+        '@label' => $this->t($this->definition->getLabel()),
         '@source_language' => $translation_language->getName(),
       )),
       '#default_value' => $translation_config,
diff --git a/core/modules/config_translation/src/FormElement/PluralVariants.php b/core/modules/config_translation/src/FormElement/PluralVariants.php
index ec6b977..2b3ec3b 100644
--- a/core/modules/config_translation/src/FormElement/PluralVariants.php
+++ b/core/modules/config_translation/src/FormElement/PluralVariants.php
@@ -26,6 +26,7 @@ protected function getSourceElement(LanguageInterface $source_language, $source_
     $element = array(
       '#type' => 'fieldset',
       '#title' => SafeMarkup::format('@label <span class="visually-hidden">(@source_language)</span>', array(
+        // Labels originate from configuration schema and are translatable.
         '@label' => $this->t($this->definition->getLabel()),
         '@source_language' => $source_language->getName(),
       )),
@@ -54,6 +55,7 @@ protected function getTranslationElement(LanguageInterface $translation_language
     $element = array(
       '#type' => 'fieldset',
       '#title' => SafeMarkup::format('@label <span class="visually-hidden">(@translation_language)</span>', array(
+        // Labels originate from configuration schema and are translatable.
         '@label' => $this->t($this->definition->getLabel()),
         '@translation_language' => $translation_language->getName(),
       )),
diff --git a/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php b/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
index cb7e0d1..f2c3c7c 100644
--- a/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
+++ b/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
@@ -128,10 +128,12 @@ protected function setUp() {
   public function testSiteInformationTranslationUi() {
     $this->drupalLogin($this->adminUser);
 
-    $site_name = 'Site name for testing configuration translation';
+    $site_name = 'Name of the site for testing configuration translation';
     $site_slogan = 'Site slogan for testing configuration translation';
+    $site_name_label = 'Site name';
     $fr_site_name = 'Nom du site pour tester la configuration traduction';
     $fr_site_slogan = 'Slogan du site pour tester la traduction de configuration';
+    $fr_site_name_label = 'Libellé du champ "Nom du site"';
     $translation_base_url = 'admin/config/system/site-information/translate';
 
     // Set site name and slogan for default language.
@@ -189,6 +191,37 @@ public function testSiteInformationTranslationUi() {
     $this->drupalGet("fr/$translation_base_url/fr/edit");
     $this->assertText($site_name);
     $this->assertText($site_slogan);
+
+    // Translate 'Site name' label in French.
+    $search = array(
+      'string' => $site_name_label,
+      'langcode' => 'fr',
+      'translation' => 'untranslated',
+    );
+    $this->drupalPostForm('admin/config/regional/translate', $search, t('Filter'));
+
+    $textarea = current($this->xpath('//textarea'));
+    $lid = (string) $textarea[0]['name'];
+    $edit = array(
+      $lid => $fr_site_name_label,
+    );
+    $this->drupalPostForm('admin/config/regional/translate', $edit, t('Save translations'));
+
+    // Ensure that the label is in French (and not in English).
+    $this->drupalGet("fr/$translation_base_url/fr/edit");
+    $this->assertText($fr_site_name_label);
+    $this->assertNoText($site_name_label);
+
+    // Ensure that the label is also in French (and not in English)
+    // when editing another language with the interface in French.
+    $this->drupalGet("fr/$translation_base_url/ta/edit");
+    $this->assertText($fr_site_name_label);
+    $this->assertNoText($site_name_label);
+
+    // Ensure that the label is not translated when the interface is in English.
+    $this->drupalGet("$translation_base_url/fr/edit");
+    $this->assertText($site_name_label);
+    $this->assertNoText($fr_site_name_label);
   }
 
   /**