Books still don't wrap long lines of text properly so until this has been sorted out I suggest reverting back to a previous working formspec which lets players read books properly until a fix is found (and maybe scrollbars added to texarea's). Also adding a recipe to blank written books.
default.gui_bg_img..
"label[0.5,0.5;by "..owner.."]"..
"label[0.5,0;"..minetest.formspec_escape(title).."]"..
- "tableoptions[background=#00000000;highlight=#00000000;border=false]"..
- "table[0.5,1.5;7.5,7;;"..minetest.formspec_escape(text):gsub("\n", ",")..";1]"
+ "textarea[0.5,1.5;7.5,7;text;;"..
+ minetest.formspec_escape(text).."]"
end
minetest.show_formspec(user:get_player_name(), "default:book", formspec)
end