diff --git a/packages/node_modules/@node-red/util/lib/i18n.js b/packages/node_modules/@node-red/util/lib/i18n.js
index 738212b82..236b66306 100644
--- a/packages/node_modules/@node-red/util/lib/i18n.js
+++ b/packages/node_modules/@node-red/util/lib/i18n.js
@@ -81,35 +81,51 @@ function mergeCatalog(fallback,catalog) {
     }
 }
 
-var MessageFileLoader = {
-    type: "backend",
-    init: function(services, backendOptions, i18nextOptions) {},
-    read: function(lng, ns, callback) {
-        if (resourceMap[ns]) {
-            var file = path.join(resourceMap[ns].basedir,lng,resourceMap[ns].file);
-            //console.log(file);
-            fs.readFile(file,"utf8",function(err,content) {
+
+function readFile(lng, ns) {
+    return new Promise((resolve, reject) => {
+        if (resourceCache[ns] && resourceCache[ns][lng]) {
+            resolve(resourceCache[ns][lng]);
+        } else if (resourceMap[ns]) {
+            var file = path.join(resourceMap[ns].basedir, lng, resourceMap[ns].file);
+            fs.readFile(file, "utf8", function (err, content) {
                 if (err) {
-                    callback(err);
+                    reject(err);
                 } else {
                     try {
-                        resourceCache[ns] = resourceCache[ns]||{};
+                        resourceCache[ns] = resourceCache[ns] || {};
                         resourceCache[ns][lng] = JSON.parse(content.replace(/^\uFEFF/, ''));
-                        //console.log(resourceCache[ns][lng]);
-                        if (lng !== defaultLang) {
-                            mergeCatalog(resourceCache[ns][defaultLang],resourceCache[ns][lng]);
+                        var baseLng = lng.split('-')[0];
+                        if (baseLng !== lng && resourceCache[ns][baseLng]) {
+                            mergeCatalog(resourceCache[ns][baseLng], resourceCache[ns][lng]);
                         }
-                        callback(null, resourceCache[ns][lng]);
-                    } catch(e) {
-                        callback(e);
+                        if (lng !== defaultLang) {
+                            mergeCatalog(resourceCache[ns][defaultLang], resourceCache[ns][lng]);
+                        }
+                        resolve(resourceCache[ns][lng]);
+                    } catch (e) {
+                        reject(e);
                     }
                 }
             });
         } else {
-            callback(new Error("Unrecognised namespace"));
+            reject(new Error("Unrecognised namespace"));
         }
-    }
+    });
+}
 
+var MessageFileLoader = {
+    type: "backend",
+    init: function (services, backendOptions, i18nextOptions) { },
+    read: function (lng, ns, callback) {
+        readFile(lng, ns)
+            .then(data => callback(null, data))
+            .catch(() => {
+                // if reading language file fails -> try reading base language (e. g. 'fr' instead of 'fr-FR' or 'de' for 'de-DE')
+                var baseLng = lng.split('-')[0];
+                readFile(baseLng, ns).then(baseData => callback(null, baseData)).catch(err => callback(err));
+            });
+    }
 }
 
 function getCurrentLocale() {