If set another language by default, it's doesn't change.
i was attached file below.
at config.json and configconstants.ts i made changes
After building and running, language by default stay english.
I tried set different languages.
but it's doesn't work
I believe, you mean that when you set parameters in config.json and configconstants.ts (like suteurl or default_lang) they are cleared after you run the project right?
forcedefaultlang = true in config.js.
npm start again and also try other browsers.