1. Open uifiles/default/EQUI_HotButtonWnd.xml
2. Find the line that starts with <Button item = "HB_Button1">
3. Underneath there will be a <TextColor> line, followed by the RGB values. Change the RGB values there to whatever colour you want.
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4. Scroll down to <Button item = "HB_Button2">, find the <TextColor> line, and change the RGB values again for the second hotbutton.
5. Repeat for all the hotbuttons all the way down to <Button item = "HB_Button10">.
6. Save file.
7. Then /load default in your client.