The problem as you mentioned is regarding to Roboto font which doesn’t support Romanian language. You can try to fix this problem on both way
1) Change it from LESS file but you need to backup anything about customization on your site before applying my below suggestion because all the customization on your site will be overridden
+ Open templates/ja_beranis/less/variables.less file
Find and change Roboto font to other font can support Romanian language
+ Go to admin JA Beranis template click Compile LESS to CSS button
2) Or you can change Roboto font directly from css file
+ Open templates/ja_beranis/css/themes/green/template.css file
Find and change Roboto font on this file
Let me know if it helps