I've downloaded the PHI theme for iPod and when I switch themes to it the screen gets darker (Brightness=1 instead of 3-4) and the Language for the menus changes to German! I had to go online to find the word for 'Language' in German, "Sprache".
To change it I choose Einstellunge (Settings), Grundeinstellungen (General), then Sprache (Language)
I checked the code in the .cfg file and it is set up this way:
#Theme Name: PHI-infoScreen
#By: PHI
#Platform: iPod Video (320x240x16) - standard build
wps: /.rockbox/wps/PHI-infoScreen.wps
font: /.rockbox/fonts/20-Terminus-Bold.fnt
foreground color: FFFFFF
background color: 5292DE
selector type: bar (gradient)
line selector start color: 6BB6FF
line selector end color: 080063
line selector text color: FFFFFF
statusbar off
backlight timeout: on
brightness: 1
backdrop: /.rockbox/backdrops/PHI-infoScreen.bmp
filetype colours: /.rockbox/themes/PHI-infoScreen.colours
lang: /.rockbox/langs/deutsch.lng
So I plugged in the iPod to my MacBook, fired up Invisibility Toggler, found the cfg file for PHI and used TextWrangler to change the brightness and lang settings on my iPod. (3 and English)
David