default to correct language base

src/kiri/init.js

@@ -2552,13 +2552,14 @@
     // inject language script if not english
     if (lang && lang !== 'en' && lang !== 'en-us') {
         lang_set = lang;
+        let map = KIRI.lang.map(lang);
         let scr = DOC.createElement('script');
         // scr.setAttribute('defer',true);
-        scr.setAttribute('src',`/kiri/lang/${lang}.js`);
+        scr.setAttribute('src',`/kiri/lang/${map}.js`);
         (DOC.body || DOC.head).appendChild(scr);
         STATS.set('ll',lang);
         scr.onload = function() {
-            KIRI.lang.set(lang);
+            KIRI.lang.set(map);
             UI.lang();
             init_one();
         };

src/kiri/lang.js

@@ -7,9 +7,28 @@
     if (self.kiri.lang) return;
 
     const KIRI = self.kiri, LANG = self.kiri.lang = { current: {} };
+    const KDFL = 'en-us';
 
     let lset = navigator.language.toLocaleLowerCase();
 
+    LANG.map = function(key) {
+        if (!key) {
+            return KDFL;
+        }
+        let tok = key.split('-');
+        switch (tok[0]) {
+            case 'en':
+                return 'en-us';
+            case 'da':
+                return 'da-dk';
+            case 'de':
+                return 'de-de';
+            case 'fr':
+                return 'fr-fr';
+        }
+        return KDFL;
+    };
+
     LANG.get = function() {
         return lset;
     };