Qt-based applications stopped working on Manjaro-Gnome

If you generated that text fom the commandline using cat, or similar, then prefix the command with LC_ALL=C to have the output in English, without unexpected artifacts; for example:

LC_ALL=C cat /etc/profile.d/qt-theming.sh

Note: This also applies to any command output requested.

You may need to provide more information for anyone to answer that question. The following tutorials may potentially help:

[How to] Find System Information and [How to] Request Support.

Cheers.