Add locale convar and locale fallback

locale/nl.lua

@@ -25,7 +25,10 @@ local Translations = {
     }
 }
 
-Lang = Locale:new({
-    phrases = Translations,
-    warnOnMissing = true
-})
+if GetConvar('qb_locale', 'en') == 'nl' then
+    Lang = Locale:new({
+        phrases = Translations,
+        warnOnMissing = true,
+        fallbackLang = Lang,
+    })
+end