Fix block plugin output (#3549)

* Corrected block plugin generator output.

* Escape block plugin names and descriptions.

* Fixed output of defaultConfiguration().

templates/module/src/Plugin/Block/block.php.twig

@@ -42,10 +42,10 @@ class {{class_name}} extends BlockBase {% if services is not empty %}implements
    *   The plugin implementation definition.
    */
   public function __construct(
-        array $configuration,
-        $plugin_id,
-        $plugin_definition,
-        {{ servicesAsParameters(services)|join(', \n\t') }}
+    array $configuration,
+    $plugin_id,
+    $plugin_definition,
+    {{ servicesAsParameters(services)|join(', \n\t') }}
   ) {
     parent::__construct($configuration, $plugin_id, $plugin_definition);
 {{ serviceClassInitialization(services) }}
@@ -69,18 +69,16 @@ class {{class_name}} extends BlockBase {% if services is not empty %}implements
 {% endblock %}
 {% block class_methods %}
 {% if inputs %}
-
   /**
    * {@inheritdoc}
    */
   public function defaultConfiguration() {
     return [
-    {% for input in inputs %}
-     '{{ input.name }}' => {{ input.default_code }},
-    {% endfor %}
+{% for input in inputs %}
+      '{{ input.name }}' => {{ input.default_code }},
+{% endfor %}
     ] + parent::defaultConfiguration();
-
- }
+  }
 
   /**
    * {@inheritdoc}
@@ -89,12 +87,12 @@ class {{class_name}} extends BlockBase {% if services is not empty %}implements
 {% for input in inputs %}
     $form['{{ input.name }}'] = [
       '#type' => '{{ input.type }}',
-      '#title' => $this->t('{{ input.label }}'),
-      '#description' => $this->t('{{ input.description }}'),
+      '#title' => $this->t('{{ input.label|escape }}'),
+      '#description' => $this->t('{{ input.description|escape }}'),
 {% if input.options|length %}
       '#options' => {{ input.options }},
 {% endif %}
-      '#default_value' => $this->configuration['{{ input.name  }}'],
+      '#default_value' => $this->configuration['{{ input.name }}'],
 {% if input.maxlength|length %}
       '#maxlength' => {{ input.maxlength }},
 {% endif %}