I'm sorry for bothering you, but I've never been at ease with forum options. How can I enlarge the font size when I'm reading? It's really hard to read japanese in small size.
I would go with valymer's suggestion. Also: a complete remake of the forums is in the works, and I will try and add in a font-size option into that version - although if you feel the font is too small over the entire site, using your browser's font-size feature will probably be the most consistent solution.
Try Control-plus to zoom in and Control-minus to zoom out if you are on Windows.
It really was that easy ! My ignorance keep surprising me! Thanks a lot, now it's much better!
I'll use this option since I'm ok with the font size in broad terms, it was just to enlarge japanese in forum discussion. Thank you マイコー, your work on this site is amazing!