3 little issues

[spir]

Hello,

Here are a few little issues I presently have with lubuntu. (I have investigated 
the web for each one of them.)

1. shutdown button disappeared from lxpanel

I have tried to apply the solution given by 'amjjawad' on the lubultu forum 
(http://ubuntuforums.org/showthread.php?t=1860263) and then reported on the faq 
(https://help.ubuntu.com/community/Lubuntu/Documentation/FAQ/Guides, see point 
6). But it simply does not work by me.

The point is to have the app 'shutdown' be listed in the app menu so that we can 
add it to an app launcher on the panel. But shutdown does not appear in the app 
menu after the given change of a config file.
I suspected maybe the categories (corresponding to a sub-menu in the app menu) 
are wrong. We write:
     Categories=Settings;DesktopSettings
but the actual category name is "Preferences" (as shown on the picture, by the 
way). I tried this but it does not help; I also tried "Préférences" since my 
desktop is in french, still with no success.

By the way, where are the apps listed in the menus, and their categories, 
listed? I would enjoy reorganising & cleaning up this a bit (according to my 
needs & views).

2. keyboard shortcuts

~ Where can I find the list of keyboard shortcuts?
~ Are they changeable?
~ Can we add shortcuts to arbitrary actions.
   In particular, I would like a shortcut for shutdown ;-)

3. system-wide font settings

I cannot find where they are. Logically, they should be in 
preferences/personalisation, but the font tab there is nearly empty /by me/: 
there is nothing about the main font setting (font, size, style...), only 
secondary settings (anti-aliasing, hinting).

I found the font setting about for OpenBox (which control eg window title fonts) 
and pcmanfm (which in fact are mainly useful to set desktop fonts), nothing more.

Thank you very much,
Denis