Detection of Umlaut / vowel mutation in German OCR

[myjob]

Description of the bug | 错误描述

as reported in issue #708, detection of Umlaut / vowel mutation (äöüÄÜÖ) in German OCR isnt working well. Furthermore, french accents are not well identified (éèÀ); see attachment
miner-u-lang-euro-ocr-test_origin.pdf
miner-u-lang-euro-ocr-test.md

How to reproduce the bug | 如何复现

magic-pdf -p miner-u-lang-euro-test.pdf -o ./out -m ocr -l german
or
magic-pdf -p miner-u-lang-euro-test.pdf -o ./out -m ocr -l french

Operating system | 操作系统

Linux

Python version | Python 版本

3.10

Software version | 软件版本 (magic-pdf --version)

0.9.x

Device mode | 设备模式

cpu