Merge pull request #46 from Yoast/fix-formal-locales-notification

Add extra check to handle formal and informal locales.

Author: afercia

src/i18n-v3.php

@@ -384,6 +384,11 @@ private function retrieve_translation_details() {
 					continue;
 				}
 
+				// For informal and formal locales, we have to complete the locale code by concatenating the slug ('formal' or 'informal') to the xx_XX part.
+				if ( $set->slug !== 'default' && strtolower( $this->locale ) === strtolower( $set->wp_locale . '_' . $set->slug ) ) {
+					return $set;
+				}
+
 				if ( $this->locale === $set->wp_locale ) {
 					return $set;
 				}