Language after installation char error

Hello for everyone.
I install dolibarr on OVH serwer. I can’t use polish char in data entry. I see ? instead polish char.
I wrote Bąk but when i save i see B?k. I try fix this problem and i check → Server language latin1 but i don’t have/ i don’t know where file my.cnf is on ovh. I have starter hosting plan. Can i fix this problem or i need to instal dolibarr on different hosting.

do you have root access on the hosting plan?