Translation file directory: wp-content/languages
Use Notepad++ editor to search for the section you want to modify, and then make the changes in the original file.
Usually, the file you can modify with the editor is the po file, but the system actually reads the mo file.
At this point, you need to compile the po file into a mo file. For example, if you modify the zh_CN.po file, you need to compile it into a zh_CN.mo file and upload it to overwrite.
Online tool for converting po to mo files: https://po2mo.net/