Request add letters with accents

[tets]

Hi, i don't know if it's good section sorry by advance.

I'm looking for client dev or tools/help to add letters with accents in my project.
I checked in systexture and i don't have L2Font-eu for my version but i have largefont-eu in system but not smallfont-eu.gly only smallfont and smallfont-e.gly.
This version was buid only for english caracters.
I tried various changes like add a L2font-eu and smallfont-eu then switch in localization language to eu but it gives me CE at start and some others bullshiets but it doesnt work.
Do you guys have some advices please ?