diff --git a/core/config/schema/core.data_types.schema.yml b/core/config/schema/core.data_types.schema.yml
index 0667c77..8230d3e 100644
--- a/core/config/schema/core.data_types.schema.yml
+++ b/core/config/schema/core.data_types.schema.yml
@@ -208,10 +208,10 @@ theme_settings:
           type: boolean
           label: 'Use default'
         alt:
-          type: string
+          type: label
           label: 'Logo alternative text'
         title:
-          type: string
+          type: label
           label: 'Logo title'
     third_party_settings:
       type: sequence
diff --git a/core/modules/system/src/Plugin/Block/SystemBrandingBlock.php b/core/modules/system/src/Plugin/Block/SystemBrandingBlock.php
index 5f09d1c..7c9c99e 100644
--- a/core/modules/system/src/Plugin/Block/SystemBrandingBlock.php
+++ b/core/modules/system/src/Plugin/Block/SystemBrandingBlock.php
@@ -156,8 +156,8 @@ public function build() {
     $build['site_logo'] = [
       '#theme' => 'image',
       '#uri' => theme_get_setting('logo.url'),
-      '#alt' => theme_get_setting('logo.alt') ?: $this->t('Home'),
-      '#title' => theme_get_setting('logo.title') ?: '',
+      '#alt' => theme_get_setting('logo.alt'),
+      '#title' => theme_get_setting('logo.title'),
       '#access' => $this->configuration['use_site_logo'],
     ];
 
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 614ad9e..afc627e 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -1927,3 +1927,23 @@ function system_update_8400(&$sandbox) {
 
   $sandbox['#finished'] = $sandbox['current'] == $sandbox['max'];
 }
+
+/**
+ * Set the default Logo alt and title.
+ */
+function system_update_8302() {
+  // Set the values for the global theme settings.
+  \Drupal::configFactory()->getEditable('system.theme.global')
+    ->set('logo.alt', 'Home')
+    ->set('logo.title', 'Home')
+    ->save(TRUE);
+
+  // Set the values for all currently installed themes.
+  $theme_handler = \Drupal::service('theme_handler');
+  foreach ($theme_handler->listInfo() as $theme) {
+    \Drupal::configFactory()->getEditable($theme->getName() . '.settings')
+      ->set('logo.alt', 'Home')
+      ->set('logo.title', 'Home')
+      ->save(TRUE);
+  }
+}
diff --git a/core/modules/system/templates/block--system-branding-block.html.twig b/core/modules/system/templates/block--system-branding-block.html.twig
index 0c7a7cb..bb1fb4f 100644
--- a/core/modules/system/templates/block--system-branding-block.html.twig
+++ b/core/modules/system/templates/block--system-branding-block.html.twig
@@ -19,12 +19,12 @@
 #}
 {% block content %}
   {% if site_logo %}
-    <a href="{{ path('<front>') }}" title="{{ site_logo_title|default('Home'|t) }}" rel="home">
-      <img src="{{ site_logo }}" alt="{{ site_logo_alt|default('Home'|t) }}" />
+    <a href="{{ path('<front>') }}" title="{{ site_logo_title }}" rel="home">
+      <img src="{{ site_logo }}" alt="{{ site_logo_alt }}" />
     </a>
   {% endif %}
   {% if site_name %}
-    <a href="{{ path('<front>') }}" title="{{ site_logo_title|default('Home'|t) }}" rel="home">{{ site_name }}</a>
+    <a href="{{ path('<front>') }}" title="{{ site_logo_title }}" rel="home">{{ site_name }}</a>
   {% endif %}
   {{ site_slogan }}
 {% endblock %}
diff --git a/core/themes/bartik/templates/block--system-branding-block.html.twig b/core/themes/bartik/templates/block--system-branding-block.html.twig
index d85b36f..7b40070 100644
--- a/core/themes/bartik/templates/block--system-branding-block.html.twig
+++ b/core/themes/bartik/templates/block--system-branding-block.html.twig
@@ -18,15 +18,15 @@
 {% set attributes = attributes.addClass('site-branding') %}
 {% block content %}
   {% if site_logo %}
-    <a href="{{ path('<front>') }}" title="{{ site_logo_title|default('Home'|t) }}" rel="home" class="site-branding__logo">
-      <img src="{{ site_logo }}" alt="{{ site_logo_alt|default('Home'|t) }}" />
+    <a href="{{ path('<front>') }}" title="{{ site_logo_title }}" rel="home" class="site-branding__logo">
+      <img src="{{ site_logo }}" alt="{{ site_logo_alt }}" />
     </a>
   {% endif %}
   {% if site_name or site_slogan %}
     <div class="site-branding__text">
       {% if site_name %}
         <div class="site-branding__name">
-          <a href="{{ path('<front>') }}" title="{{ site_logo_title|default('Home'|t) }}" rel="home">{{ site_name }}</a>
+          <a href="{{ path('<front>') }}" title="{{ site_logo_title }}" rel="home">{{ site_name }}</a>
         </div>
       {% endif %}
       {% if site_slogan %}
diff --git a/core/themes/classy/templates/block/block--system-branding-block.html.twig b/core/themes/classy/templates/block/block--system-branding-block.html.twig
index ba593d1..7c03c2f 100644
--- a/core/themes/classy/templates/block/block--system-branding-block.html.twig
+++ b/core/themes/classy/templates/block/block--system-branding-block.html.twig
@@ -15,13 +15,13 @@
 #}
 {% block content %}
   {% if site_logo %}
-    <a href="{{ path('<front>') }}" title="{{ site_logo_title|default('Home'|t) }}" rel="home" class="site-logo">
-      <img src="{{ site_logo }}" alt="{{ site_logo_alt|default('Home'|t) }}" />
+    <a href="{{ path('<front>') }}" title="{{ site_logo_title }}" rel="home" class="site-logo">
+      <img src="{{ site_logo }}" alt="{{ site_logo_alt }}" />
     </a>
   {% endif %}
   {% if site_name %}
     <div class="site-name">
-      <a href="{{ path('<front>') }}" title="{{ site_logo_title|default('Home'|t) }}" rel="home">{{ site_name }}</a>
+      <a href="{{ path('<front>') }}" title="{{ site_logo_title }}" rel="home">{{ site_name }}</a>
     </div>
   {% endif %}
   {% if site_slogan %}
diff --git a/core/themes/stable/templates/block/block--system-branding-block.html.twig b/core/themes/stable/templates/block/block--system-branding-block.html.twig
index c75e3e6..c2dc2b6 100644
--- a/core/themes/stable/templates/block/block--system-branding-block.html.twig
+++ b/core/themes/stable/templates/block/block--system-branding-block.html.twig
@@ -15,12 +15,12 @@
 #}
 {% block content %}
   {% if site_logo %}
-    <a href="{{ path('<front>') }}" title="{{ site_logo_title|default('Home'|t) }}" rel="home">
-      <img src="{{ site_logo }}" alt="{{ site_logo_alt|default('Home'|t) }}" />
+    <a href="{{ path('<front>') }}" title="{{ site_logo_title }}" rel="home">
+      <img src="{{ site_logo }}" alt="{{ site_logo_alt }}" />
     </a>
   {% endif %}
   {% if site_name %}
-    <a href="{{ path('<front>') }}" title="{{ site_logo_title|default('Home'|t) }}" rel="home">{{ site_name }}</a>
+    <a href="{{ path('<front>') }}" title="{{ site_logo_title }}" rel="home">{{ site_name }}</a>
   {% endif %}
   {{ site_slogan }}
 {% endblock %}