Fixing Quicksilver Localizations

I fixed some typos in the branch recently, so now more stuff shows up  
as localized in the interface ;-). Quicksilver just needs a  
localization update for some of the stuff, but I think there's a need  
to redesign how localization is handled in the code, so it's in  
waiting line...

By the way, I need some help on localization. I need to complete all  
missing keys for the English localization, so they can be used as a  
starting point for other languages. So here's a quick guide on how to  
do this :
If you want to check which stuff isn't localized, try setting  
QSDebugLocalization in the environment. It will output line with the  
format "Localization: Missing key %@ in table %@, using default %@" in  
the console each time a localized key is missing. Then you can  
manually add it to the corresponding .strings file (There are a bunch  
of those, but the file name is indicated by the table in the log  
message. The problem with this approach is that you don't have a  
direct way of knowing to which plugin belongs which key, and I want to  
keep localization separate).

If someone is interested in writing some patches for the  
aforementioned files, I'll be happy to apply them ;-).