Update app.py

app.py

@@ -305,7 +305,7 @@ def generate_pdf(title, editor, concept_art):
   pdf = PDF()
   pdf.title = "Untitled" if title.strip() == "" else title
   pdf.art = None if concept_art is None else f"{tmp_filename}.png"
-  pdf.print_chapter(editor)
+  pdf.print_chapter(editor.encode('latin-1', 'replace').decode('latin-1'))
   pdf.output(f'{tmp_filename}.pdf', 'F')
 
   return (