diff --git a/core/modules/config_translation/src/FormElement/ElementInterface.php b/core/modules/config_translation/src/FormElement/ElementInterface.php
index a3cc1d6..47cd387 100644
--- a/core/modules/config_translation/src/FormElement/ElementInterface.php
+++ b/core/modules/config_translation/src/FormElement/ElementInterface.php
@@ -9,7 +9,6 @@
 
 use Drupal\Core\Config\Config;
 use Drupal\Core\Language\LanguageInterface;
-use Drupal\Core\TypedData\DataDefinitionInterface;
 use Drupal\language\Config\LanguageConfigOverride;
 
 /**
diff --git a/core/modules/config_translation/src/FormElement/FormElementBase.php b/core/modules/config_translation/src/FormElement/FormElementBase.php
index ec9a023..3881346 100644
--- a/core/modules/config_translation/src/FormElement/FormElementBase.php
+++ b/core/modules/config_translation/src/FormElement/FormElementBase.php
@@ -85,7 +85,7 @@ public function getElements(LanguageInterface $source_language, LanguageInterfac
    * @return array
    *   A render array for the source value.
    */
-  public function getSourceElement(LanguageInterface $source_language, $source_config) {
+  protected function getSourceElement(LanguageInterface $source_language, $source_config) {
     if ($source_config) {
       $value = '<span lang="' . $source_language->getId() . '">' . nl2br($source_config) . '</span>';
     }
@@ -141,7 +141,7 @@ public function getSourceElement(LanguageInterface $source_language, $source_con
    * translation of complex data, similar access logic must be implemented
    * manually.
    *
-   * @param \Drupal\Core\Language\LanguageInterface $language
+   * @param \Drupal\Core\Language\LanguageInterface $translation_language
    *   The language to display the translation form for.
    * @param mixed $source_config
    *   The configuration value of the element in the source language.
@@ -154,7 +154,7 @@ public function getSourceElement(LanguageInterface $source_language, $source_con
    * @see \Drupal\config_translation\FormElement\TextFormat
    * @see filter_process_format()
    */
-  public function getTranslationElement(LanguageInterface $translation_language, $source_config, $translation_config) {
+  protected function getTranslationElement(LanguageInterface $translation_language, $source_config, $translation_config) {
     // Add basic properties that apply to all form elements.
     return array(
       '#title' => $this->t('!label <span class="visually-hidden">(!source_language)</span>', array(