Moodle in English
The WordTable plugin (which I developed, see https://moodle.org/plugins/qformat_wordtable) allows you import and export questions from Word. In Word, it uses headings for question categories and names, so using the navigation pane feature of Word is quite a convenient way to manage questions (see this video for an explanation: https://www.youtube.com/watch?embed=no&v=WBzSSoLl61Q). Word also has good search (and replace) facilities.
For questions already in the question bank, you could export them to a Moodle Question XML format file, edit the file in a text editor, and do a global search and replace to change
When you re-import the the XML file, I believe they should overwrite the existing questions.
For questions not yet in the question bank, you could consider my Microsoft Word File Import/Export (Question Format) plugin, which allows you create questions in a table in Word, and supports editing all the question metadata, including the default mark. You can then import the Word file directly into the Moodle question bank in a course, and each table is converted into a separate question. In the longer term, you can probably train the teachers to write the questions using this facility, and do yourself out of a boring job. I have some instructional videos on this Moodle2Word YouTube playlist.