PWA-805: Expose localization system / store config from GraphQL

Author: eug123

app/code/Magento/StoreGraphQl/Model/Resolver/AvailableStoresResolver.php

@@ -41,7 +41,7 @@ public function resolve(
         array $value = null,
         array $args = null
     ) {
-        $storeGroupId = !empty($args['use_current_group']) ?
+        $storeGroupId = !empty($args['useCurrentGroup']) ?
             (int)$context->getExtensionAttributes()->getStore()->getStoreGroupId() :
             null;
         return $this->storeConfigDataProvider->getAvailableStoreConfig(

app/code/Magento/StoreGraphQl/etc/schema.graphqls

@@ -3,7 +3,7 @@
 type Query {
     storeConfig : StoreConfig @resolver(class: "Magento\\StoreGraphQl\\Model\\Resolver\\StoreConfigResolver") @doc(description: "The store config query") @cache(cacheable: false)
     availableStores(
-        use_current_group : Boolean @doc(description: "Get only store views from the current store group")
+        useCurrentGroup: Boolean @doc(description: "Get only store views from the current store group")
     ): [StoreConfig] @resolver(class: "Magento\\StoreGraphQl\\Model\\Resolver\\AvailableStoresResolver") @doc(description: "Get a list of available store views and their config information.")
 }