Implement Lex's suggestion

bb.sh

@@ -221,7 +221,7 @@ global_variables() {
     # Experts only. You may need to tune the locales too
     # Leave empty for no conversion, which is not recommended
     # This default filter respects backwards compatibility
-    convert_filename="iconv -f utf-8 -t cp1251//translit | iconv -f cp1251 -t utf-8 | sed 's/^-*//' | tr [:upper:] [:lower:] | tr ' ' '-' | tr -dc '[:alnum:]-'"
+    convert_filename="iconv -f utf-8 -t ascii//translit | sed 's/^-*//' | tr [:upper:] [:lower:] | tr ' ' '-' | tr -dc '[:alnum:]-'"
 
     # Markdown location. Trying to autodetect by default.
     # The invocation must support the signature 'markdown_bin in.md > out.html'