docusaurus/lib/server/translation.js

const CWD = process.cwd();
const fs = require("fs");
const glob = require("glob");
const path = require("path");

let languages;
if (fs.existsSync(CWD + "/languages.js")) {
  languages = require(CWD + "/languages.js");
} else {
  languages = [
    {
      enabled: true,
      name: "English",
      tag: "en"
    }
  ];
}

const enabledLanguages = languages.filter(lang => lang.enabled);

const translation = { languages: enabledLanguages };

const files = glob.sync(CWD + "/i18n/**");
const langRegex = /\/i18n\/(.*)\.json$/;

files.forEach(file => {
  const extension = path.extname(file);
  if (extension === ".json") {
    const match = langRegex.exec(file);
    const language = match[1];
    translation[language] = require(file);
  }
});

module.exports = translation;