diff --git a/js/documents.js b/js/documents.js
index 3c44b34b..d902d182 100644
--- a/js/documents.js
+++ b/js/documents.js
@@ -129,7 +129,7 @@ var documentsMain = {
 			var urlsrc = documentsMain.urlsrc +
 			  "WOPISrc=" + wopisrc +
 			  "&title=" + encodeURIComponent(title) +
-			  "&lang=" + OC.getLocale() +
+			  "&lang=" + OC.getLocale().replace('_', '-') + // loleaflet expects a BCP47 language tag syntax
 			  "&permission=readonly";
 
 			// access_token - must be passed via a form post
@@ -320,7 +320,7 @@ var documentsMain = {
 			var urlsrc = documentsMain.urlsrc +
 				"WOPISrc=" + wopisrc +
 				"&title=" + encodeURIComponent(title) +
-				"&lang=" + OC.getLocale() +
+				"&lang=" + OC.getLocale().replace('_', '-') + // loleaflet expects a BCP47 language tag syntax
 				"&closebutton=1" +
 				"&revisionhistory=1";
 			if (!documentsMain.canEdit || action === "view") {
diff --git a/lib/Controller/DocumentController.php b/lib/Controller/DocumentController.php
index c2eb7621..72c5bafd 100644
--- a/lib/Controller/DocumentController.php
+++ b/lib/Controller/DocumentController.php
@@ -233,13 +233,8 @@ class DocumentController extends Controller {
 		if ($content && $view->file_put_contents($path, $content)) {
 			$info = $view->getFileInfo($path);
 			$ret = $this->wopiParser->getUrlSrc($mimetype);
-			$lolang = strtolower(str_replace('_', '-', $this->settings->getUserValue($this->uid, 'core', 'lang', 'en')));
 			$response =  array(
 				'status' => 'success',
-				'fileid' => $info['fileid'] . '_' . $this->settings->getSystemValue('instanceid'),
-				'urlsrc' => $ret['urlsrc'],
-				'action' => $ret['action'],
-				'lolang' => $lolang,
 				'data' => \OCA\Files\Helper::formatFileInfo($info)
 			);
 		} else {