diff --git a/og_access/og_access.info.yml b/og_access/og_access.info.yml
index 0a1474b89..b15aa25b4 100644
--- a/og_access/og_access.info.yml
+++ b/og_access/og_access.info.yml
@@ -7,4 +7,3 @@ type: module
 
 dependencies:
   - og
-  - og_ui
diff --git a/og_access/og_access.module b/og_access/og_access.module
index ee3063f66..dc4aa6c42 100644
--- a/og_access/og_access.module
+++ b/og_access/og_access.module
@@ -18,31 +18,7 @@ use Drupal\field\Entity\FieldConfig;
 use Drupal\node\NodeInterface;
 use Drupal\og\Og;
 use Drupal\og_access\OgAccessBundleFormAlter;
-
-/**
- * The access realm of group member.
- */
-define('OG_ACCESS_REALM', 'og_access');
-
-/**
- * Group public access field.
- */
-define('OG_ACCESS_FIELD', 'group_access');
-
-/**
- * Group public access field.
- */
-define('OG_ACCESS_CONTENT_FIELD', 'group_content_access');
-
-/**
- * Public group/group content access.
- */
-define('OG_ACCESS_PUBLIC', 0);
-
-/**
- * Private group/group content access.
- */
-define('OG_ACCESS_PRIVATE', 1);
+use Drupal\og_access\OgAccess;
 
 /**
  * Implements hook_node_grants().
@@ -58,7 +34,7 @@ function og_access_node_grants(AccountInterface $account, $op) {
     foreach ($groups as $group_type => $entity_groups) {
       /** @var \Drupal\core\Entity\EntityInterface $group */
       foreach ($entity_groups as $group) {
-        $realm = OG_ACCESS_REALM . ':' . $group_type;
+        $realm = OgAccess::OG_ACCESS_REALM . ':' . $group_type;
         $grants[$realm][] = $group->id();
       }
     }
@@ -72,7 +48,7 @@ function og_access_node_grants(AccountInterface $account, $op) {
  */
 function og_access_node_access_records(NodeInterface $node) {
   if (!$node->isPublished()) {
-    // Node is unpublished, so we don't allow every group member to see it.
+    // Node is unpublished, so we don't allow any group member to see it.
     return [];
   }
 
@@ -80,22 +56,22 @@ function og_access_node_access_records(NodeInterface $node) {
   $gids = [];
 
   if (Og::isGroup('node', $node->getType()) &&
-      $node->hasField(OG_ACCESS_FIELD) &&
-      !empty($node->{OG_ACCESS_FIELD}) && $node->{OG_ACCESS_FIELD}->value) {
+      $node->hasField(OgAccess::OG_ACCESS_FIELD) &&
+      !empty($node->{OgAccess::OG_ACCESS_FIELD}) && $node->{OgAccess::OG_ACCESS_FIELD}->value) {
     // Private group.
     $gids['node'][] = $node->id();
   }
 
-  if ($node->hasField(OG_ACCESS_CONTENT_FIELD) &&
-      !empty($node->get(OG_ACCESS_CONTENT_FIELD))) {
-    $content_access = $node->get(OG_ACCESS_CONTENT_FIELD)->value;
+  if ($node->hasField(OgAccess::OG_ACCESS_CONTENT_FIELD) &&
+      !empty($node->get(OgAccess::OG_ACCESS_CONTENT_FIELD))) {
+    $content_access = $node->get(OgAccess::OG_ACCESS_CONTENT_FIELD)->value;
   }
   else {
-    $content_access = OG_ACCESS_PUBLIC;
+    $content_access = OgAccess::OG_ACCESS_PUBLIC;
   }
 
   switch ($content_access) {
-    case OG_ACCESS_PUBLIC:
+    case OgAccess::OG_ACCESS_PUBLIC:
       // Skip non-group content nodes.
       if (!Og::isGroupContent('node', $node->getType())) {
         break;
@@ -114,8 +90,8 @@ function og_access_node_access_records(NodeInterface $node) {
             continue;
           }
 
-          if ($group->hasField(OG_ACCESS_FIELD) && !empty($group->get(OG_ACCESS_FIELD)) &&
-              $group->get(OG_ACCESS_FIELD)->value) {
+          if ($group->hasField(OgAccess::OG_ACCESS_FIELD) && !empty($group->get(OgAccess::OG_ACCESS_FIELD)) &&
+              $group->get(OgAccess::OG_ACCESS_FIELD)->value) {
             $has_private = TRUE;
           }
         }
@@ -125,7 +101,7 @@ function og_access_node_access_records(NodeInterface $node) {
       }
       break;
 
-    case OG_ACCESS_PRIVATE:
+    case OgAccess::OG_ACCESS_PRIVATE:
       $list_gids = [];
       /** @var \Drupal\og\OgGroupAudienceHelper $audience_helper */
       $audience_helper = \Drupal::service('og.group_audience_helper');
@@ -142,7 +118,7 @@ function og_access_node_access_records(NodeInterface $node) {
   foreach ($gids as $group_type => $values) {
     foreach ($values as $gid) {
       $grants[] = [
-        'realm' => OG_ACCESS_REALM . ':' . $group_type,
+        'realm' => OgAccess::OG_ACCESS_REALM . ':' . $group_type,
         'gid' => $gid,
         'grant_view' => 1,
         'grant_update' => 0,
@@ -198,9 +174,9 @@ function og_access_entity_type_save(EntityInterface $entity) {
   // Add/remove on the group itself.
   $is_group = Og::isGroup($entity_type_id, $bundle);
   if ($entity->og_is_group || $is_group) {
-    $field = FieldConfig::loadByName($entity_type_id, $bundle, OG_ACCESS_FIELD);
+    $field = FieldConfig::loadByName($entity_type_id, $bundle, OgAccess::OG_ACCESS_FIELD);
     if (!$field && $enable_og_access) {
-      Og::createField(OG_ACCESS_FIELD, $entity_type_id, $bundle);
+      Og::createField(OgAccess::OG_ACCESS_FIELD, $entity_type_id, $bundle);
     }
     elseif ($field) {
       if (!$enable_og_access || $is_group && !$entity->og_is_group) {
@@ -212,10 +188,10 @@ function og_access_entity_type_save(EntityInterface $entity) {
   // Add remove the relevant field to the group content bundle.
   $is_group_content = Og::isGroupContent($entity_type_id, $bundle);
   if ($entity->og_group_content_bundle || $is_group_content) {
-    $field = FieldConfig::loadByName($entity_type_id, $bundle, OG_ACCESS_CONTENT_FIELD);
+    $field = FieldConfig::loadByName($entity_type_id, $bundle, OgAccess::OG_ACCESS_CONTENT_FIELD);
 
     if (!$field && $enable_og_access) {
-      Og::createField(OG_ACCESS_CONTENT_FIELD, $entity_type_id, $bundle);
+      Og::createField(OgAccess::OG_ACCESS_CONTENT_FIELD, $entity_type_id, $bundle);
     }
     elseif ($field) {
       if (!$enable_og_access || $is_group_content && !$entity->og_group_content_bundle) {
diff --git a/og_access/src/OgAccess.php b/og_access/src/OgAccess.php
new file mode 100644
index 000000000..ee1237935
--- /dev/null
+++ b/og_access/src/OgAccess.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Drupal\og_access;
+
+/**
+ * Helper class for constants.
+ */
+class OgAccess {
+
+  /**
+   * The access realm of group member.
+   */
+  const OG_ACCESS_REALM = 'og_access';
+
+  /**
+   * Group public access field.
+   */
+  const OG_ACCESS_FIELD = 'group_access';
+
+  /**
+   * Group public access field.
+   */
+  const OG_ACCESS_CONTENT_FIELD = 'group_content_access';
+
+  /**
+   * Public group/group content access.
+   */
+  const OG_ACCESS_PUBLIC = 0;
+
+  /**
+   * Private group/group content access.
+   */
+  const OG_ACCESS_PRIVATE = 1;
+
+}
diff --git a/og_access/src/OgAccessBundleFormAlter.php b/og_access/src/OgAccessBundleFormAlter.php
index ee80ea871..35ffe35ec 100644
--- a/og_access/src/OgAccessBundleFormAlter.php
+++ b/og_access/src/OgAccessBundleFormAlter.php
@@ -5,11 +5,13 @@
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\og\Og;
+use Drupal\Core\StringTranslation\TranslationInterface;
 
 /**
  * Helper for og_access_form_alter().
  */
 class OgAccessBundleFormAlter {
+  use StringTranslationTrait;
 
   /**
    * The entity bundle.
@@ -37,9 +39,12 @@ class OgAccessBundleFormAlter {
    *
    * @param \Drupal\Core\Entity\EntityInterface $entity
    *   The entity object.
+   * @param Drupal\Core\StringTranslation\TranslationInterface $string_translation
+   *   The string translation object.
    */
-  public function __construct(EntityInterface $entity) {
+  public function __construct(EntityInterface $entity, TranslationInterface $string_translation) {
     $this->entity = $entity;
+    $this->stringTranslation = $string_translation;
   }
 
   /**
@@ -59,8 +64,8 @@ public function formAlter(array &$form, FormStateInterface $form_state) {
 
     $form['og']['og_enable_access'] = [
       '#type' => 'checkbox',
-      '#title' => t('Restrict access to group members'),
-      '#description' => t('Enable OG access control. Provides a new field that determines the group/group content visibility. Public groups can have member-only content. Any public group content belonging to a private group will be restricted to the members of that group only.'),
+      '#title' => $this->t('Restrict access to group members'),
+      '#description' => $this->t('Enable OG access control. Provides a new field that determines the group/group content visibility. Public groups can have member-only content. Any public group content belonging to a private group will be restricted to the members of that group only.'),
       '#default_value' => $this->bundle ? $this->hasAccessControl() : FALSE,
       '#states' => [
         'visible' => [
@@ -75,7 +80,7 @@ public function formAlter(array &$form, FormStateInterface $form_state) {
    * Checks whether the existing bundle has OG access control enabled.
    *
    * @return bool
-   *   True if the group bundle has the OG_ACCESS_FIELD field -OR-
+   *   True if the group bundle has the OgAccess::OG_ACCESS_FIELD field -OR-
    *        if the group content bundle has the OG_CONTENT_ACCESS_FIELD field.
    *   False otherwise.
    */
@@ -84,11 +89,11 @@ protected function hasAccessControl() {
       ->getFieldDefinitions($this->entityTypeId, $this->bundle);
 
     if (Og::isGroup($this->entityTypeId, $this->bundle)) {
-      return isset($field_definitions[OG_ACCESS_FIELD]);
+      return isset($field_definitions[OgAccess::OG_ACCESS_FIELD]);
     }
 
     if (Og::isGroupContent($this->entityTypeId, $this->bundle)) {
-      return isset($field_definitions[OG_ACCESS_CONTENT_FIELD]);
+      return isset($field_definitions[OgAccess::OG_ACCESS_CONTENT_FIELD]);
     }
 
     return FALSE;
diff --git a/og_access/src/Plugin/OgFields/OgAccessField.php b/og_access/src/Plugin/OgFields/OgAccessField.php
index 9c25060cd..d8d117e27 100644
--- a/og_access/src/Plugin/OgFields/OgAccessField.php
+++ b/og_access/src/Plugin/OgFields/OgAccessField.php
@@ -24,8 +24,8 @@ public function getFieldStorageBaseDefinition(array $values = []) {
       'cardinality' => 1,
       'settings' => [
         'allowed_values' => [
-          0 => 'Public - accessible to all site users',
-          1 => 'Private - accessible only to group members',
+          0 => $this->t('Public - accessible to all site users'),
+          1 => $this->t('Private - accessible only to group members'),
         ],
         'allowed_values_function' => '',
       ],
diff --git a/og_access/src/Plugin/OgFields/OgContentAccessField.php b/og_access/src/Plugin/OgFields/OgContentAccessField.php
index caadb52f9..341f8d1ca 100644
--- a/og_access/src/Plugin/OgFields/OgContentAccessField.php
+++ b/og_access/src/Plugin/OgFields/OgContentAccessField.php
@@ -9,7 +9,7 @@
  * Determine the group content visibility.
  *
  * @OgFields(
- *  id = OG_ACCESS_CONTENT_FIELD,
+ *  id = OgAccess::OG_ACCESS_CONTENT_FIELD,
  *  type = "node",
  *  description = @Translation("Determine the group content visibility.")
  * )
@@ -24,8 +24,8 @@ public function getFieldStorageBaseDefinition(array $values = []) {
       'cardinality' => 1,
       'settings' => [
         'allowed_values' => [
-          0 => 'Public - accessible to all site users',
-          1 => 'Private - accessible only to group members',
+          0 => $this->t('Public - accessible to all site users'),
+          1 => $this->t('Private - accessible only to group members'),
         ],
         'allowed_values_function' => '',
       ],