How to bold text on w810?

Hey guys, i have 2 w810is and was wanting help on one of them. I bought one after my other broke and I used sony update manager on the broken one and it is working again. The only complaint is that when I was comparing it with my other phone I noticed that the Inbox/Sent Messages and status text was small and thin. Also the menu that says the battery percentage. I would like to know if there is any way to fix that small problem on my phone. All i want to do is bold the text in those areas, as all the other areas are actually good.

What do I have to change in my layout.xml to make it bold sms inbox?