Hi ...many of the newer models have built in glow-light, check out YouTube reviews links below.
-"not have a touchscreen"? again many have both touch screen and buttons, hence you don't need to use the Touch screen if you don't want to.
-"be able to read polish signs", do you mean read out polish text voice-to-text or be able to display polish text, if the later then most problably will be OK, the inplication of you question suggests partial sightedness ? but be aware that Kindles will restrict the file formats.
I have an older Nook Glow-light, buttons, touch screen, light etc I'd look at Youtube reviews from
https://www.youtube.com/user/goodereader or
https://www.youtube.com/user/TheeBookReader.
What ever eReader you settle on, I recommend that for organizing and/or changing file formats etc the very best and free program for the PC is CALIBRE.
Hope this helps