dev: don't proxy /lang/

webpack.config.js

 function devServerProxyBypass({ path }) {
     if (path.startsWith('/css/') || path.startsWith('/doc/')
             || path.startsWith('/fonts/') || path.startsWith('/images/')
+            || path.startsWith('/lang/')
             || path.startsWith('/sounds/')
             || path.startsWith('/static/')
             || path.endsWith('.wasm')) {