It depends on the project.
Projects developed on the web@plako platform: to change a translation map, you need to ask Plako for the file. That xml file will then be sent by email to you and when the file is returned the translation map is updated by Plako.
Projects developed on the cms@plako platform: generating a translation map may be done by the client, using tools available on the section for managing projects' interfaces (https://project.[partners domain]). To learn how to generate translation maps please check the Technical Guide.