What is the best way to organize the process of localizing applications for different platforms?

Question

Machine translation from one language to another

There is a certain service that works on the principle of client-server, which needs to be translated into a new language.
On the server, localization works under gettext. There are clients on QT, Android, iOS - each of the clients uses native localization technology.
Question: how best to organize the translation process. Give the translator all resource files, and a software package for each platform?