Merge branch '3490696-missing-translatability' into '2.0.x'

Issue #3490696 by grimreaper: Missing translatability

See merge request !279

src/Element/ComponentForm.php

@@ -257,7 +257,7 @@ class ComponentForm extends ComponentFormBase {
    */
   private static function buildSlotsForm(array $element, string $component_id): array {
     return [
-      '#title' => 'Slots',
+      '#title' => t('Slots'),
       '#type' => 'component_slots_form',
       '#component_id' => $component_id,
       '#source_contexts' => $element['#source_contexts'],
@@ -275,7 +275,7 @@ class ComponentForm extends ComponentFormBase {
    */
   private static function buildPropsForm(array $element, string $component_id): array {
     return [
-      '#title' => 'Props',
+      '#title' => t('Props'),
       '#type' => 'component_props_form',
       '#component_id' => $component_id,
       '#source_contexts' => $element['#source_contexts'],