syncthing unable to start on non-ascii environments

touch .config/syncthing/config.xml

and try again

change locale with en_US.UTF-8

do not install syncthing-gtk & start syncthing as user service

https://wiki.archlinux.org/index.php/Syncthing

-- sample?

[Unit]
Description=Syncthing server

[Service]
ExecStart=
ExecStart=/bin/bash -c 'set -o pipefail; /usr/bin/syncthing -no-browser -no-restart -logflags=0 | grep -v "INFO: "'

[Install]
WantedBy=multi-user.target