Merge pull request #4174 from mbrunet-carbon/fix-4082/merged-doc-bad-url-redirection

fix: c2org#4082 merged doc redirect to bad url

Author: eddy-geek

src/views/document/utils/document-view-mixin.js

@@ -144,7 +144,7 @@ export default {
     },
 
     lang() {
-      return this.document?.cooked?.lang;
+      return this.document?.cooked?.lang ?? this.$language.current;
     },
   },