fix: Temporary fix allowing to set fallback locale codes

Author: trodrigues

lib/entities/locale.js

@@ -37,6 +37,8 @@ function createLocaleApi (http) {
       // be sent back.
       const locale = this
       delete locale.default
+      locale.fallbackCode = locale.fallback_code
+      delete locale.fallback_code
       return createUpdateEntity({
         http: http,
         entityPath: 'locales',