New user notification Email not translateable

In what way is it not found? Not found by what? When doing what? Please describe your problem, what you’ve tried and how it relates to using this plugin.

Ok, sorry!
Wordpress is sending an Email to new user after registration. I want to translate this mail in german. I use Loco Translate and was searching in the admin-de_DE.po and admin-network-de_DE.po for the related strings, which I did not find.
Thank you for feedback, br, Stefan

What is the string? From what did you generate the PO files? Is the string in the official translations for your version of WordPress?

The files are the original ones (I guess). Source of the translation is:
# Translation of WordPress – 5.2.x – Administration in German
# This file is distributed under the same license as the WordPress – 5.2.x – Administration package.

Here you find the Email: https://share-your-photo.com/260c085cfac628f1/admin

I’m running 5.2.4 and the text in your screenshot is not anywhere in the WordPress core code.

Finding specific translatable strings in your website is beyond the remit of my support. Possibly that text comes from some plugin and you should translate that instead.

Hi Tim, thank you! I will search in my plugins.
Br, Stefan

Hi Tim! I searched in all relevant plugins and did not find the string for the mail. The mail might be from WordPress? The original Email was sent from [email protected]. I changed that.
I was also searching that the mail content can be changed with the hook “wp_new_user_notification_email” in pluggable.php. But I do not no how and where I can find the action code.
May be you you have any suggestions? Thank you, Stefan

As I said previously – I don’t offer help finding where strings in your website come from. Nor do I offer general coding help with things like pluggable.php. I checked the WordPress core for you and the text is not in there. I recommend you ask on a general WordPress help forum.