diff --git a/website/src/libs/api-v3/i18n.js b/website/src/libs/api-v3/i18n.js
new file mode 100644
index 0000000000..96ad15a2e7
--- /dev/null
+++ b/website/src/libs/api-v3/i18n.js
@@ -0,0 +1,98 @@
+import fs from 'fs';
+import path from 'path';
+import _ from 'lodash';
+import shared from '../../../../common';
+
+const localePath = path.join(__dirname, '/../../../../common/locales/');
+
+// Store translations
+export let translations = {};
+// Store MomentJS localization files
+export let momentLangs = {};
+
+// Handle differencies in language codes between MomentJS and /locales
+let momentLangsMapping = {
+  en: 'en-gb',
+  en_GB: 'en-gb', // eslint-disable-line camelcase
+  no: 'nn',
+  zh: 'zh-cn',
+  es_419: 'es', // eslint-disable-line camelcase
+};
+
+function _loadTranslations (locale) {
+  let files = fs.readdirSync(path.join(localePath, locale));
+
+  translations[locale] = {};
+
+  files.forEach((file) => {
+    if (path.extname(file) !== '.json') return;
+
+    // We use require to load and parse a JSON file
+    _.merge(translations[locale], require(path.join(localePath, locale, file))); // eslint-disable-line global-require
+  });
+}
+
+// First fetch English strings so we can merge them with missing strings in other languages
+_loadTranslations('en');
+
+// Then load all other languages
+fs.readdirSync(localePath).forEach((file) => {
+  if (file === 'en' || fs.statSync(path.join(localePath, file)).isDirectory() === false) return;
+  _loadTranslations(file);
+
+  // Merge missing strings from english
+  _.defaults(translations[file], translations.en);
+});
+
+// Add translations to shared
+shared.i18n.translations = translations;
+
+export let langCodes = Object.keys(translations);
+
+export let avalaibleLanguages = langCodes.map((langCode) => {
+  return {
+    code: langCode,
+    name: translations[langCode].languageName,
+  };
+});
+
+langCodes.forEach((code) => {
+  let lang = _.find(avalaibleLanguages, {code});
+
+  lang.momentLangCode = momentLangsMapping[code] || code;
+
+  try {
+    // MomentJS lang files are JS files that has to be executed in the browser so we load them as plain text files
+    // We wrap everything in a try catch because the file might not exist
+    let f = fs.readFileSync(path.join(__dirname, `/../../../node_modules/moment/locale/${lang.momentLangCode}.js`), 'utf8');
+
+    momentLangs[code] = f;
+  } catch (e) { // eslint-disable-lint no-empty
+    // TODO implement some type of error loggin?
+    // The catch block is mandatory so can't be removed
+  }
+});
+
+// Remove en_GB from langCodes checked by browser to avoid it being
+// used in place of plain original 'en' (it's an optional language that can be enabled only in setting)
+export let defaultLangCodes = _.without(langCodes, 'en_GB');
+
+// A map of languages that have different versions and the relative versions
+export let multipleVersionsLanguages = {
+  es: ['es-419', 'es-mx', 'es-gt', 'es-cr', 'es-pa', 'es-do', 'es-ve', 'es-co', 'es-pe',
+        'es-ar', 'es-ec', 'es-cl', 'es-uy', 'es-py', 'es-bo', 'es-sv', 'es-hn',
+        'es-ni', 'es-pr'],
+  zh: ['zh-tw'],
+};
+
+// Export en strings only, temporary solution for mobile
+// This is copied from middlewares/locals#t()
+// TODO review if this can be removed since the old mobile app is no longer active
+// stringName and vars are the allowed parameters
+export function enTranslations (...args) {
+  let language = _.find(avalaibleLanguages, {code: 'en'});
+
+  // language.momentLang = ((!isStaticPage && i18n.momentLangs[language.code]) || undefined);
+  args.push(language.code);
+  return shared.i18n.t(...args);
+}
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diff --git a/website/src/middlewares/api-v3/getUserLanguage.js b/website/src/middlewares/api-v3/getUserLanguage.js
new file mode 100644
index 0000000000..9a273b79bf
--- /dev/null
+++ b/website/src/middlewares/api-v3/getUserLanguage.js
@@ -0,0 +1,85 @@
+import { model as User } from '../../models/user';
+import accepts from 'accepts';
+import _ from 'lodash';
+import {
+  translations,
+  defaultLangCodes,
+  multipleVersionsLanguages,
+} from '../../libs/api-v3/i18n';
+
+function _getFromBrowser (req) {
+  let acceptedLanguages = accepts(req).languages();
+
+  let acceptable = _(acceptedLanguages).map((lang) => {
+    return lang.slice(0, 2);
+  }).uniq().value();
+
+  let matches = _.intersection(acceptable, defaultLangCodes);
+
+  let iAcceptedCompleteLang = matches.length > 0 ? multipleVersionsLanguages.indexOf(matches[0].toLowerCase()) : -1;
+
+  if (iAcceptedCompleteLang !== -1) {
+    let acceptedCompleteLang = _.find(acceptedLanguages, (accepted) => {
+      return accepted.slice(0, 2) === multipleVersionsLanguages[iAcceptedCompleteLang];
+    });
+
+    if (acceptedCompleteLang) {
+      acceptedCompleteLang = acceptedCompleteLang.toLowerCase();
+    } else {
+      return 'en';
+    }
+
+    if (matches[0] === 'es') {
+      // In case of a Latin American version of Spanish use 'es_419'
+      return multipleVersionsLanguages.es.indexOf(acceptedCompleteLang !== -1) ? 'es_419' : 'es';
+    } else if (matches[0] === 'zh') {
+      let iChinese = multipleVersionsLanguages.zh.indexOf(acceptedCompleteLang.toLowerCase());
+
+      return iChinese !== -1 ? multipleVersionsLanguages.zh[iChinese] : 'zh';
+    } else {
+      return 'en';
+    }
+  } else if (matches.length > 0) {
+    return matches[0].toLowerCase();
+  } else {
+    return 'en';
+  }
+}
+
+function _getFromUser (user, req) {
+  let lang;
+
+  if (user && user.preferences.language && translations[user.preferences.language]) {
+    lang = user.preferences.language;
+  } else {
+    let preferred = _getFromBrowser(req);
+
+    lang = translations[preferred] ? preferred : 'en';
+  }
+
+  return lang;
+}
+
+export default function getUserLanguage (req, res, next) {
+  if (req.query.lang) { // In case the language is specified in the request url, use it
+    req.language = translations[req.query.lang] ? req.query.lang : 'en';
+    return next();
+  } else if (req.locals && req.locals.user) { // If the request is authenticated, use the user's preferred language
+    req.language = _getFromUser(req.locals.user, req);
+    return next();
+  } else if (req.session && req.session.userId) { // Same thing if the user has a valid session
+    User
+    .findOne({
+      _id: req.session.userId,
+    }, 'preferences.language')
+    .exec()
+    .then((user) => {
+      req.language = _getFromUser(user, req);
+      return next();
+    })
+    .catch(next);
+  } else { // Otherwise get from browser
+    req.language = _getFromUser(null, req);
+    return next();
+  }
+}
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