Starting seahub.sh "LC_ALL is not set in ENV, set to en_US.UTF-8"

Hi,

with server 6.1.1 on CentOS 7 (but also if I go back to 6.1.0),
message remains with both alternatives in seahub.service:
Environment=“LC_ALL=C”
or
Environment=“LC_ALL=en_US.UTF-8”

seahub.service is the one of the manual page (with paths configured for my setup).
# systemctl status seahub.service:

systemctl status seahub.service
● seahub.service - Seafile hub
Loaded: loaded (/etc/systemd/system/seahub.service; enabled; vendor preset: disabled)
Active: active (exited) since Tue 2017-06-27 10:22:34 CEST; 2min 33s ago
Process: 1259 ExecStop=/seafile/seafile-server-latest/seahub.sh stop (code=exited, status=0/SUCCESS)
Process: 1446 ExecStart=/seafile/seafile-server-latest/seahub.sh start-fastcgi (code=exited, status=0/SUCCESS)
Main PID: 1446 (code=exited, status=0/SUCCESS)
CGroup: /user.slice/user-0.slice/session-25.scope/system.slice/seahub.service
├─1471 python2.7 /seafile/seafile-server-6.1.1/seahub/manage.py runfcgi host=127.0.0.1 port=8000 pidfile…
├─1472 python2.7 /seafile/seafile-server-6.1.1/seahub/manage.py runfcgi host=127.0.0.1 port=8000 pidfile…
├─1473 python2.7 /seafile/seafile-server-6.1.1/seahub/manage.py runfcgi host=127.0.0.1 port=8000 pidfile…
├─1474 python2.7 /seafile/seafile-server-6.1.1/seahub/manage.py runfcgi host=127.0.0.1 port=8000 pidfile…
├─1475 python2.7 /seafile/seafile-server-6.1.1/seahub/manage.py runfcgi host=127.0.0.1 port=8000 pidfile…
└─1476 python2.7 /seafile/seafile-server-6.1.1/seahub/manage.py runfcgi host=127.0.0.1 port=8000 pidfile…

Jun 27 10:22:29 seafile systemd[1]: Starting Seafile hub…
Jun 27 10:22:29 seafile seahub.sh[1446]: LANG is not set in ENV, set to en_US.UTF-8
Jun 27 10:22:29 seafile seahub.sh[1446]: Starting seahub (fastcgi) at 127.0.0.1:8000 …
Jun 27 10:22:34 seafile seahub.sh[1446]: Seahub is started
Jun 27 10:22:34 seafile seahub.sh[1446]: Done.
Jun 27 10:22:34 seafile systemd[1]: Started Seafile hub.

I’m not sure of the correlation, because I did not tested immediately, but from then on, I’m no more able to have image previews in web interface, or I get “file does not exist” for example with pdf, when there are space in folder names. If instead I move single files to folders with no spaced names, the preview is available, I can view pdf, or download other kind of files.
The workaround of moving every single file (it doesn’t resolve the problem when moving entire folders) seems not so efficient.

Have a nice day
leo