Error in german language file plg_jem_mailer.ini

Hi all
I just noticed an error in the german language file plg_jem_mailer.ini which causes the file not to be loaded:
on line 200
PLG_JEM_MAILER_LOG_SEND_ERROR="Fehler beim Senden einer Emails an "_QQ_"%s"_QQ_"_QQ_
at the end "_QQ_ has to be removed in order to work (compared to the english version)
This bug may be due to strange Transifex behavior
Discussed here: issues.joomla.org/tracker/joomla-cms/15378
HTH

Indeed there's something really strange!

A bit of research and I found this:

The Transifex files are linked to the source on Github. Every 24 Transifex is updated automatically.

The link to Github for this pluging is at:
raw.githubusercontent.com/jemproject/JEM-Project/master/plugins/plg_jem_mailer/language/en-GB/en-GB.plg_jem_mailer.ini

And the string reads: but off course it should be:
The only way to correct this is to update the Github source.

Let me discuss with Jojo via PM

I tried with but then the language file isn't working
so I propose:

PLG_JEM_MAILER_LOG_SEND_ERROR="Error sending email to %s"

Then the language file is working, but how can I test the email?
Does anyone know, what I have to do to get an email with this error notice?

This message is used only in logging as far as i can see in the code.
You have turn on Joomla Debugging (see here docs.joomla.org/Using_JLog ) and you have to set the debug plugin to log almost everything. Then change an email adress to a wrong adress and book an event this user.
I have used your PLG_JEM_MAILER_LOG_SEND_ERROR in my german language file and it worked
from the log file:
2020-05-12T21:07:58+00:00 WARNING ::1 jem Error sending email to unknown@infotech.ch : SMTP-Fehler! Die folgenden Empfänger sind nicht korrekt: unknown@infotech.ch: : Recipient address rejected: User unknown in virtual mailbox table
HTH