When i create new site users by comma separated value file upload, moodle incoretly treats Latvian (lv) characters āēīū ļ and others.

text from csv file;

username,password,firstname,lastname,email,city,lang

arturs,arturs,Artūrs,Silovs,arturs_silovs@yahoo.lv,Ogre,lv

And error after user creation is in name Artūrs

site language is set to lv