Chain to translate is hard coded in French in the code, So when you double click on qelectrotec.exe you bypass the binary translations (qet_*.qm files contained in the lang folder) and launches program with French language UI.

set command=bin\qelectrotech.exe -platform windows:fontengine=freetype --common-elements-dir=elements/ --common-tbt-dir=titleblocks/ --lang-dir=lang/ --config-dir=conf/ -style plastique %*
@start %command%

I did some additional research and found out (some details might only be valid for my unzipped (Portable?) version):

• It's not necessary to use that hand made batch. The unzipped App contains a file Lancer QET.bat

• Double click on that batch will launch W\bin\qelectrotech.exe

• Changing Language in Menu ˋSettings → Configure ... Languages → [ok]ˊ wil not show any effect. That's expected, because Dialog tells "Applied to nextlaunch ..."

• To change UI language it is necessary to ˋClose → Launch with double click on Lancer QET.bat (!!!)ˊ

• That will launch qelectrotech with selected UI language

Lancer QET.bat will not be modified by selecting a different language for UI
 
I wonder which other Changes do need launch via that batch to get them applied to qelectrotech. Launch directly with double click on qelectrotech.exe again launches program with French language UI

Ich habe:
QElectroTech V 0.80c+87c957a06d79751d3
Compilation : GCC 9.3.0
Built with Qt 5.15.2 - Date : Feb 21 2021 : 10:29:35
Run with Qt 5.15.2 using 12 thread(s)
CPU : NAME AMD RYZEN 5 3600 6-CORE PROCESSOR
RAM Total : 16334 MB
RAM Available : 9117 MB
GPU : VideoProcessor GeForce GT 710
GPU RAM : RAM Total : AdapterRAM 2147483648 B
OS : winnt - x86_64 - Version : Windows 10 Version 2009 - Kernel : 10.0.19042
*** Qt screens ***
( 1 : 1920 x 1080 )

Wer kann meine Desktopverknüpfung so ändern, dass das Programm in deutsch gestartet wird?  Aktuell:
"D:\Dateien\Ressourcen\ECAD\qelectrotech-0.80+git7124-x86-win32-readytouse\bin\qelectrotech.exe --common-elements-dir=elements/ --common-tbt-dir=titleblocks/ --lang-dir=lang/ --config-dir=conf/ *"   (ich weiß, dass das nicht funktionieren kann)
Funktionieren:
""

Dake schon mal imvoraus

Rainer

Wenn du die Eigenschaften des angehefteten Symbols änderst (Rechtsklick auf Icon -> Rechtsklick auf qelectrotech) -> Eigenschaften) musst du unter "Ziel" den Text "-platform windows:fontengine=freetype --common-elements-dir=elements/ --common-tbt-dir=titleblocks/ --lang-dir=lang/ %*" ergänzen und danach unter "Ausführen in" den rechten Teil "\bin" löschen.

Wenn du magst, kannst du dann über "Eigenes Symbol" selbiges auf das Original-Icon anpassen. Das Symbol liegt unter i.d.R im Verzeichnis "%ProgramFiles%\QElectroTech\ico\qelectrotech.ico", falls du den Pfad bei der Installation nicht verändert hast.

Dann klappt auch der Aufruf aus der Taskleiste (zumindest bei mir).

set command=bin\qelectrotech.exe -platform windows:fontengine=freetype --common-elements-dir=elements/ --common-tbt-dir=titleblocks/ --lang-dir=lang/ --config-dir=conf/ -style plastique %*
No, it will not work without modifying the command line in bat file.

@Scorpio810
Does the file Lancer Qet.bat have to be in the same directory
as qelectrotech.exe?
Should the QElectroTech Portable files be stored in the directory
C:\Users\Name\My Files to avoid problems with user rights to avoid problems with user rights?

yes, try like this.

@echo off

rem Se rend dans le dossier qui convient
set current_dir=%~dp0
cd /d %current_dir%

rem Met la collection QET en lecture seule
attrib +r elements/* /S /D

set LANG=de_DE
rem lance QElectroTech
set command=bin\qelectrotech.exe -platform windows:fontengine=freetype --common-elements-dir=elements/ --common-tbt-dir=titleblocks/ --lang-dir=lang/ --config-dir=conf/ -style plastique %*

@start %command%

Or :

@echo off

rem Se rend dans le dossier qui convient
set current_dir=%~dp0
cd /d %current_dir%

rem Met la collection QET en lecture seule
attrib +r elements/* /S /D


rem lance QElectroTech
set command=bin\qelectrotech.exe -platform windows:fontengine=freetype --common-elements-dir=elements/ --common-tbt-dir=titleblocks/ --lang-dir=lang/ --config-dir=conf/ set LANG=de_DE -style plastique %*

@start %command%

@echo off

rem Se rend dans le dossier qui convient
set current_dir=%~dp0
cd /d %current_dir%

rem Met la collection QET en lecture seule
attrib +r elements/* /S /D

rem lance QElectroTech
set command=bin\qelectrotech.exe -platform windows:fontengine=freetype --common-elements-dir=elements/ --common-tbt-dir=titleblocks/ --lang-dir=lang/ --config-dir=conf/ -style plastique %*
set LANG=de_DE
@start %command%

Doesn't work either, tested as user or admin. Should I place the command in a different line?

Rudi