diff --git a/src/document.js b/src/document.js
index b9e297d4a..d0e2cc687 100644
--- a/src/document.js
+++ b/src/document.js
@@ -1,3 +1,5 @@
+import { getRootPath } from 'nextcloud-server/dist/router'
+import { languageToBCP47 } from './helpers'
 /* TODO: move to one object */
 /* global richdocuments_directEdit richdocuments_fileId richdocuments_urlsrc richdocuments_token richdocuments_path richdocuments_permissions richdocuments_title getURLParameter richdocuments_canonical_webroot */
 
@@ -142,11 +144,11 @@ var documentsMain = {
 
 	// generates docKey for given fileId
 	_generateDocKey: function(wopiFileId) {
-		var ocurl = OC.getRootPath() + '/index.php/apps/richdocuments/wopi/files/' + wopiFileId
+		var ocurl = getRootPath() + '/index.php/apps/richdocuments/wopi/files/' + wopiFileId
 		if (richdocuments_canonical_webroot) {
 			if (!richdocuments_canonical_webroot.startsWith('/')) { richdocuments_canonical_webroot = '/' + richdocuments_canonical_webroot }
 
-			ocurl = ocurl.replace(OC.getRootPath(), richdocuments_canonical_webroot)
+			ocurl = ocurl.replace(getRootPath(), richdocuments_canonical_webroot)
 		}
 
 		return ocurl
@@ -165,10 +167,6 @@ var documentsMain = {
 		return null
 	},
 
-	getLanguage: function() {
-		return OC.getLanguage ? OC.getLanguage() : OC.getLocale()
-	},
-
 	UI: {
 		/* Editor wrapper HTML */
 		container: '<div id="mainContainer" class="claro">'
@@ -380,7 +378,7 @@ var documentsMain = {
 
 			// WOPISrc - URL that loolwsd will access (ie. pointing to ownCloud)
 			// index.php is forced here to avoid different wopi srcs for the same document
-			var wopiurl = window.location.protocol + '//' + window.location.host + OC.getRootPath() + '/index.php/apps/richdocuments/wopi/files/' + fileId
+			var wopiurl = window.location.protocol + '//' + window.location.host + getRootPath() + '/index.php/apps/richdocuments/wopi/files/' + fileId
 			var wopisrc = encodeURIComponent(wopiurl)
 
 			// urlsrc - the URL from discovery xml that we access for the particular
@@ -390,7 +388,7 @@ var documentsMain = {
 			var urlsrc = documentsMain.urlsrc
 				+ 'WOPISrc=' + wopisrc
 				+ '&title=' + encodeURIComponent(title)
-				+ '&lang=' + documentsMain.getLanguage().replace('_', '-') // loleaflet expects a BCP47 language tag syntax
+				+ '&lang=' + languageToBCP47()
 				+ '&permission=readonly'
 
 			// access_token - must be passed via a form post
@@ -562,7 +560,7 @@ var documentsMain = {
 			$(document.body).prepend(documentsMain.UI.container)
 
 			// WOPISrc - URL that loolwsd will access (ie. pointing to ownCloud)
-			var wopiurl = window.location.protocol + '//' + window.location.host + OC.getRootPath() + '/index.php/apps/richdocuments/wopi/files/' + documentsMain.fileId
+			var wopiurl = window.location.protocol + '//' + window.location.host + getRootPath() + '/index.php/apps/richdocuments/wopi/files/' + documentsMain.fileId
 			var wopisrc = encodeURIComponent(wopiurl)
 
 			// urlsrc - the URL from discovery xml that we access for the particular
@@ -572,7 +570,7 @@ var documentsMain = {
 			var urlsrc = documentsMain.urlsrc
 				+ 'WOPISrc=' + wopisrc
 				+ '&title=' + encodeURIComponent(title)
-				+ '&lang=' + documentsMain.getLanguage().replace(/^([a-z]{2}).*_([A-Z]{2})$/, function(match, p1, p2) { return p1 + '-' + p2.toLowerCase() }) // loleaflet expects a BCP47 language tag syntax
+				+ '&lang=' + languageToBCP47()
 				+ '&closebutton=1'
 				+ '&revisionhistory=1'
 			if (!documentsMain.canEdit || action === 'view') {
diff --git a/src/helpers/index.js b/src/helpers/index.js
new file mode 100644
index 000000000..bebca3fc6
--- /dev/null
+++ b/src/helpers/index.js
@@ -0,0 +1,33 @@
+/*
+ * @copyright Copyright (c) 2019 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+import { getLanguage } from 'nextcloud-server/dist/l10n'
+
+const languageToBCP47 = () => {
+	// loleaflet expects a BCP47 language tag syntax
+	return getLanguage()
+		.replace(/^([a-z]{2}).*_([A-Z]{2})$/, (match, p1, p2) => p1 + '-' + p2.toLowerCase())
+}
+
+export {
+	languageToBCP47
+}