E175012 and E175002 when trying to commit

Hi list,

committing a huge change-set (about 110.000 new files, 10.000 deletions, 50.000 modified file, about 2GiB data payload) fails with a timeout during transaction submit:

$> svn ci -F svn-commit.tmp .
Sende ...
Lösche ...
Füge hinzu ...
...
Übertrage Daten ........
...
.................erledigt
Übertrage Transaktion...
svn: E175012: Übertragen schlug fehl (Details folgen):
svn: E175012: Die Wartezeit für die Verbindung ist abgelaufen
svn: E200042: Zusätzliche Fehler:
svn: E175012: Die Wartezeit für die Verbindung ist abgelaufen

Before posting this to the mailing list I wanted to get the message in English. But, changing LANG also changed the behaviour.
The client no longer tries to submit the transaction at all but fails straight away with:

$> LANG=en_GB.UTF-8 svn ci -F svn-commit.tmp .
svn: E175002: Commit failed (details follow):
svn: E175002: Unexpected HTTP status 413 'Request Entity Too Large' on '/svn/ThirdParty/!svn/me'

This is reproducible. Running with de_DE.UTF-8 (my default LANG), svn will try to submit the change but runs into a time-out. Running with en_GB.UTF-8, svn fails with error 413.

Why is subversion acting differently with different language setting on the client side?

Any ideas what can be done to successfully commit the changes?

Client
svn --version
svn, Version 1.11.1 (r1850623)

Server:
VisualSVN Server 3.9.2 (Subversion 1.10.3, Apache 2.4.35)

--
Regards
Christoph
Sigma Surface Science GmbH, Idsteiner Str. 78, 65232 Taunusstein. Amtsgericht Wiesbaden, HRB 27422. Geschäftsführer: Norbert Nold