Could LALEL be display letter other than English?

Yes, check documentation.
You can either include new font into firmware or load runtime.
Just make sure your source code file is in UTF-8, and UTF-8 character codes match your font’s codes.
Related forum topic:

Free fonts to download:
https://www.dafont.com/

To see the codes/glyphs of font (TTF) characters:
https://www.glyphrstudio.com/online/

Convert TTF to binary font file (where you can set range of codes/glyphs to be exported from TTF to binary file):