System Font Bold, System Font Size Changer and Advanced System Font Changer have similar user interfaces. They are also very similar in terms of text, so you can import language files to this software.
From a translation point of view, there is only a minimal difference between System Font Size Changer and Advanced System Font Changer. Import also helps a lot with System Font Bold.
I recommend reading the completed translation guide. Thank you for the translations.
New About Panel - Translators