Faster to reach goal "quick change language" would be this approach I guess:
open regedit
walk where that language string is defined
left tree view = right click on it, select export selected
save it on desktop for real fast access or elsewhere and create shortcut for it (on desktop no shortcut needed)
back in regedit
change language to whatever else value
right click on it, select export
save it on desktop for real fast access or elsewhere and create shortcut for it (on desktop no shortcut needed)
I prefer to save as Win9x-Nt4 format, than it is plain text and you can modify with Notepad.
Open both files with Notepad and remove all definitions that not belong to your language-hack.
the end.