NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
Using LANGUAGE=en:xx will cause programs incorrectly fallback to xx language, instead of using English.
STEPS TO REPRODUCE
1. Have zh_CN locale and corresponding translations for systemsettings on the machine.
2. LANGUAGE=en:zh_CN systemsettings --help
3. LANGUAGE=en_US:zh_CN systemsettings --help
4. LANGUAGE=en_CA:zh_CN systemsettings --help
In 2 and 4, the help information is partly English and partly Chinese.
In 3 it is fully English.
They should all be in fully English.
Linux/KDE Plasma: 5.16.12-gentoo-x86_64 / 5.24.4
(available in About System)
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3
This can also be confirmed using the following programs:
kwin_x11, plasmashell, okular, ark, konqueror
Non-ki18n-based applications (pure gettext, e.g. `ls` in coreutils) give fully Chinese output, even if the first LANG is en_US.
It seems ki18n is doing *some* workaround here, but not fully.
Yes, you should never put any other language after English, as it triggers bugs in some apps that make bad assumptions that the C locale is the same as English. See Bug 192019 for an explanation of what happens and why.
if you want to see Chinese, put Chinese first in the list, and then English after it--not the other way around.
*** This bug has been marked as a duplicate of bug 192019 ***