Hope so you’re doing good, to resolve this issue, you will need to manually add the missing translation string to the pot file or update the pot file with the latest version that includes the missing translation. Once the translation is added or updated, you should be able to translate it to German using the Loco plugin.
Hope so this will work for you!
> or update the pot file with the latest version that includes the missing translation
ok, but there is no translation file containing that string. So I can add it to my po/mo file, but not the pot file, because that would be overwritten by the next plugin update.
I guess adding to the pot file has to be done by the plugin devs and my add to po/mo in a secured folder is only a workaround.