Pass the lang paramater to loleaflet from ownCloud user settings, which controls UI language

controller/documentcontroller.php

@@ -256,7 +256,8 @@ class DocumentController extends Controller {
 			$response =  array(
 				'status' => 'success',
 				'fileid' => $info['fileid'],
-				'urlsrc' => $this->getWopiSrcUrl($discovery_parsed, $mimetype, 'edit')
+				'urlsrc' => $this->getWopiSrcUrl($discovery_parsed, $mimetype, 'edit'),
+				'lolang' => $this->settings->getUserValue($this->uid, 'core', 'lang', 'en')
 			);
 		} else {
 			$response =  array(
@@ -471,6 +472,7 @@ class DocumentController extends Controller {
 			$documents[$key]['icon'] = preg_replace('/\.png$/', '.svg', \OCP\Template::mimetype_icon($document['mimetype']));
 			$documents[$key]['hasPreview'] = \OC::$server->getPreviewManager()->isMimeSupported($document['mimetype']);
 			$documents[$key]['urlsrc'] = $this->getWopiSrcUrl($discovery_parsed, $document['mimetype'], 'edit');
+			$documents[$key]['lolang'] = strtolower(str_replace('_', '-', $this->settings->getUserValue($this->uid, 'core', 'lang', 'en')));
 			$fileIds[] = $document['fileid'];
 		}
 

js/documents.js

@@ -32,6 +32,7 @@ $.widget('oc.documentGrid', {
 			.attr('title', document.path)
 			.attr('original-title', document.path)
 			.attr('urlsrc', document.urlsrc)
+			.attr('lolang', document.lolang)
 			.find('label').text(document.name)
 		;
 
@@ -234,6 +235,7 @@ var documentsMain = {
 					var urlsrc = $('li[data-id='+ documentsMain.fileId +']>a').attr('urlsrc') +
 						"WOPISrc=" + wopisrc +
 						"&title=" + encodeURIComponent(title) +
+						"&lang=" + $('li[data-id='+ documentsMain.fileId +']>a').attr('lolang') +
 						"&closebutton=1";
 
 					// access_token - must be passed via a form post
@@ -466,6 +468,7 @@ var documentsMain = {
 				if (response && response.fileid){
 					docElem.attr('data-id', response.fileid);
 					docElem.find('a').attr('urlsrc', response.urlsrc);
+					docElem.find('a').attr('lolang', response.lolang);
 					documentsMain.prepareSession();
 					documentsMain.joinSession(response.fileid);
 				} else {