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Thank you for contacting WPML Support. There's a server protection before reaching your wp-admin login fields, I would need these access details as well. As regarding your issue, if you theme provide translated po/mo files for the WordPress Dashboard strings then it should be displayed when you change the language of your admin sections. For example, if you are viewing your WordPress Dashboard in german and the plugin has translated po/mo german files, then it should be loaded by WordPress. Can you please, confirm if you are changing the admin language?
If you mean, using the po/mo files provided by the plugin in your website frontend instead of having to translate all the strings again, then you can make sure you are using the option 'Use String Translation but load .mo files as a backup' from your WordPress Dashboard > WPML > Theme and plugins localization settings. Please, let me know if it helps. Have a nice day.