Add language in JS context (#3116)

app/views/helpers/javascript_vars.phtml

@@ -55,6 +55,7 @@ echo htmlspecialchars(json_encode(array(
 		'notif_body_articles' => _t('gen.js.feedback.body_new_articles'),
 		'notif_request_failed' => _t('gen.js.feedback.request_failed'),
 		'category_empty' => _t('gen.js.category_empty'),
+		'language' => FreshRSS_Context::$user_conf->language,
 	),
 	'icons' => array(
 		'read' => rawurlencode(_i('read')),