scripts: fix all issues reported by pylint

This patch 1) fixes all the issues (not most) reported by pylint,
2) add the functionability to tackle documents that need translation,
3) add logging to adjust the logging level and log file

Signed-off-by: Dongliang Mu <dzm91@hust.edu.cn>
Reviewed-by: Yanteng Si <siyanteng@loongson.cn>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240719041400.3909775-2-dzm91@hust.edu.cn