Hi, in one_time_login_link_admin/one_time_login_link_admin.module we find:
$message['subject'] = t('Your one time login link for @title', array('@title' => $params['title']), $options);
I added a German translation for the string - but it seems not to work.
Although the body text in the e-mail is translated correctly, the subject is not translated.
Is this maybe not the correct place to translate subjects? The body is translated within emailLoginLink() in one_time_login_link_admin/src/Controller/OneTimeLoginLinkController.php
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Ok, I found the problem. It seems, that the body language translation is taken from user interface and the subject from users preferred admin language.
I can solve the problem for me by changing the preferred language for all users to DE and by sending the links from German interface.