--- /dev/null
+/**
+ * Implements hook_field_available_languages_alter().
+ */
+function {{ machine_name }}_field_available_languages_alter(&$languages, $context) {
+ // Add an unavailable language.
+ $languages[] = 'xx';
+
+ // Remove an available language.
+ $index = array_search('yy', $languages);
+ unset($languages[$index]);
+}