Add New Language

To add a new language proceed as follow:

Backend and frontend

1. Add the new language ISO 639-1 code and its label in src/config/env.config.ts in LANGUAGES constant.
2. Add the translations in src/lang/*.ts.

Mobile App

1. Add the new language ISO 639-1 code and its label in config/env.config.ts in LANGUAGES constant.
2. Create a new file <ISO 639-1 code>.ts in lang folder and add the translations in it.
3. Add your translations to lang/i18n.ts