add migration file

src/migrations/20200620203632-normalize-locale-id.js

@@ -0,0 +1,47 @@
+require('module-alias/register');
+const logger = require('@alias/logger')('growi:migrate:normalize-locale-id');
+
+const mongoose = require('mongoose');
+const config = require('@root/config/migrate');
+
+const { getModelSafely } = require('@commons/util/mongoose-utils');
+
+module.exports = {
+  async up(db, client) {
+    logger.info('Apply migration');
+    mongoose.connect(config.mongoUri, config.mongodb.options);
+
+    const Config = getModelSafely('Config') || require('@server/models/config')();
+    const User = getModelSafely('User') || require('@server/models/user')();
+
+    await Promise.all([
+      // update en-US -> en_US
+      Config.update(
+        { key: 'app:globalLang', value: JSON.stringify('en-US') },
+        { value: JSON.stringify('en_US') },
+      ),
+      // update ja -> ja_JP
+      Config.update(
+        { key: 'app:globalLang', value: JSON.stringify('ja') },
+        { value: JSON.stringify('ja_JP') },
+      ),
+
+      // update en-US -> en_US
+      User.updateMany(
+        { lang: 'en-US' },
+        { lang: 'en_US' },
+      ),
+      // update ja -> ja_JP
+      User.updateMany(
+        { lang: 'ja' },
+        { lang: 'ja_JP' },
+      ),
+    ]);
+
+    logger.info('Migration has successfully applied');
+  },
+
+  async down(db, client) {
+    // do not rollback
+  },
+};