Issue #2929783 by tim.plunkett, MerryHamster, bnjmnm, xjm, webchick,...

Issue #2929783 by tim.plunkett, MerryHamster, bnjmnm, xjm, webchick, samuel.mortenson, EclipseGc, kevincrafts, ndf, DyanneNova, yoroy, TheodorosPloumis, tedbow, pixelite, seanB, phenaproxima, AaronMcHale, benjifisher: Review Layout Builder UI terminology

core/modules/layout_builder/layout_builder.routing.yml

@@ -2,6 +2,7 @@ layout_builder.choose_section:
   path: '/layout_builder/choose/section/{section_storage_type}/{section_storage}/{delta}'
   defaults:
    _controller: '\Drupal\layout_builder\Controller\ChooseSectionController::build'
+   _title: 'Choose a layout for this section'
   requirements:
     _permission: 'configure any layout'
     _layout_builder_access: 'view'
@@ -58,6 +59,7 @@ layout_builder.choose_block:
   path: '/layout_builder/choose/block/{section_storage_type}/{section_storage}/{delta}/{region}'
   defaults:
     _controller: '\Drupal\layout_builder\Controller\ChooseBlockController::build'
+    _title: 'Choose a block'
   requirements:
     _permission: 'configure any layout'
     _layout_builder_access: 'view'
@@ -71,6 +73,7 @@ layout_builder.add_block:
   path: '/layout_builder/add/block/{section_storage_type}/{section_storage}/{delta}/{region}/{plugin_id}'
   defaults:
     _form: '\Drupal\layout_builder\Form\AddBlockForm'
+    _title: 'Configure block'
   requirements:
     _permission: 'configure any layout'
     _layout_builder_access: 'view'
@@ -97,6 +100,7 @@ layout_builder.update_block:
   path: '/layout_builder/update/block/{section_storage_type}/{section_storage}/{delta}/{region}/{uuid}'
   defaults:
     _form: '\Drupal\layout_builder\Form\UpdateBlockForm'
+    _title: 'Configure block'
   requirements:
     _permission: 'configure any layout'
     _layout_builder_access: 'view'

core/modules/layout_builder/src/Controller/ChooseBlockController.php

@@ -74,7 +74,6 @@ public static function create(ContainerInterface $container) {
    *   A render array.
    */
   public function build(SectionStorageInterface $section_storage, $delta, $region) {
-    $build['#title'] = $this->t('Choose a block');
     if ($this->entityTypeManager->hasDefinition('block_content_type') && $types = $this->entityTypeManager->getStorage('block_content_type')->loadMultiple()) {
       if (count($types) === 1) {
         $type = reset($types);

core/modules/layout_builder/src/Controller/ChooseSectionController.php

@@ -59,8 +59,6 @@ public static function create(ContainerInterface $container) {
    *   The render array.
    */
   public function build(SectionStorageInterface $section_storage, $delta) {
-    $output['#title'] = $this->t('Choose a layout');
-
     $items = [];
     $definitions = $this->layoutManager->getFilteredDefinitions('layout_builder', [], ['section_storage' => $section_storage]);
     foreach ($definitions as $plugin_id => $definition) {