Thanks everyone. I have restored all lost entries, I'm just not sure about the command to start Gparted. I guess it should be:
To sum this up:
1) The easiest option is to leave all unused entries intact and just use the check mark to turn them on/off.
2) If you really insist on deleting an unused entry in some categories and you want to have it shown in other categories, then back up the command to a text file before deleting, and then paste it back after re-creating the entry in another category. This way you will have some really neat menus. At this point, all re-created entries will have the same generic icon. Getting the original icon back would require some extra work.
Code:
gksudo gparted
To sum this up:
1) The easiest option is to leave all unused entries intact and just use the check mark to turn them on/off.
2) If you really insist on deleting an unused entry in some categories and you want to have it shown in other categories, then back up the command to a text file before deleting, and then paste it back after re-creating the entry in another category. This way you will have some really neat menus. At this point, all re-created entries will have the same generic icon. Getting the original icon back would require some extra work.
LL 2.4, Xubuntu 14.04.2, Debian 8, Manjaro