Make sure importer is aware of ICU domain format

Because of MessageCatalogue interface limitation we're using NSA to
access raw messages data.
Additionally because defines() method uses isset() were force to check
raw messages data directly to check if key exits (translations from
source collection are all set to NULL).

php-translation#300

Service/Importer.php

@@ -78,8 +78,8 @@ public function extractToCatalogues(Finder $finder, array $catalogues, array $co
             $this->convertSourceLocationsToMessages($target, $sourceCollection, $catalogue);
 
             // Remove all SourceLocation and State form catalogue.
-            foreach ($catalogue->getDomains() as $domain) {
-                foreach ($catalogue->all($domain) as $key => $translation) {
+            foreach (NSA::getProperty($catalogue, 'messages') as $domain => $translations) {
+                foreach ($translations as $key => $translation) {
                     $meta = $this->getMetadata($catalogue, $key, $domain);
                     $meta->removeAllInCategory('file-source');
                     $meta->removeAllInCategory('state');
@@ -91,28 +91,36 @@ public function extractToCatalogues(Finder $finder, array $catalogues, array $co
             $result = $merge->getResult();
             $domains = $merge->getDomains();
 
+            $resultMessages = NSA::getProperty($result, 'messages');
+
             // Mark new messages as new/obsolete
             foreach ($domains as $domain) {
+                $intlDomain = $domain . '+intl-icu' /* MessageCatalogueInterface::INTL_DOMAIN_SUFFIX */;
+
                 foreach ($merge->getNewMessages($domain) as $key => $translation) {
-                    $meta = $this->getMetadata($result, $key, $domain);
+                    $messageDomain = array_key_exists($key, $resultMessages[$intlDomain] ?? []) ? $intlDomain : $domain;
+
+                    $meta = $this->getMetadata($result, $key, $messageDomain);
                     $meta->setState('new');
-                    $this->setMetadata($result, $key, $domain, $meta);
+                    $this->setMetadata($result, $key, $messageDomain, $meta);
 
                     // Add custom translations that we found in the source
                     if (null === $translation) {
                         if (null !== $newTranslation = $meta->getTranslation()) {
-                            $result->set($key, $newTranslation, $domain);
+                            $result->set($key, $newTranslation, $messageDomain);
                             // We do not want "translation" key stored anywhere.
                             $meta->removeAllInCategory('translation');
                         } elseif (null !== ($newTranslation = $meta->getDesc()) && $catalogue->getLocale() === $this->defaultLocale) {
-                            $result->set($key, $newTranslation, $domain);
+                            $result->set($key, $newTranslation, $messageDomain);
                         }
                     }
                 }
                 foreach ($merge->getObsoleteMessages($domain) as $key => $translation) {
-                    $meta = $this->getMetadata($result, $key, $domain);
+                    $messageDomain = array_key_exists($key, $resultMessages[$intlDomain] ?? []) ? $intlDomain : $domain;
+
+                    $meta = $this->getMetadata($result, $key, $messageDomain);
                     $meta->setState('obsolete');
-                    $this->setMetadata($result, $key, $domain, $meta);
+                    $this->setMetadata($result, $key, $messageDomain, $meta);
                 }
             }
             $results[] = $result;