Localizing your screenshots
To localize your project, press the action icon in the Project Screen navigation bar, and choose "Export for Localization". This will create an xliff file containing the titles and subtitles for each screen in the project's base language, which you can send to the translator of your choice. (Personally I use One Sky, but there are plenty of localization services out there.)
Note that you don't have to add localization languages before creating the xliff file - any missing languages ones will added when xliff files are imported (the screenshots will be copied from the base language)
To import localized xliff files, tap the action icon and select "Import Localizations". With Screenshot Producer you can import an xliff file that contain multiple target languages, or multiple files that contain a single target language.