whatis-distro: typo
install-guide/vm: update error message
install-guide/vm: translate / typo fix
Merge branch 'master' into simply-linux
desktop-xfce: adaptation
desktop-software..pidgin: update supported protocol list
desktop-software..thunderbird: update for no menu File
Merge branch 'master' into simply-linux
update menus for Xfce
updated screenshots

based on altlinux-6.993.0_beta20130328-simply-x86_64-install-dvd5
Add info about Install DVD and LiveDVD

-This commit add and edit some information in "Install Guide" section.
-Some chapters got brackets with comments like (only to Install DVD)
 or (only to LiveDVD).
-Add 3 screenshots to chapters related to "Install DVD".
remove mention about "Setup from CD"

Simply gonna be DVD-only distro as I see.