[#3218] Fix shortcuts in configuration

sflphone-client-gnome/src/callable_obj.c

sflphone-client-gnome/src/contacts/calltree.c

sflphone-client-gnome/src/contacts/calltree.h

sflphone-client-gnome/src/sflphone_const.h

sflphone-client-gnome/src/shortcuts.c

sflphone-common/src/config/yamlemitter.cpp

sflphone-common/src/config/yamlemitter.h

sflphone-common/src/config/yamlparser.cpp

sflphone-common/src/config/yamlparser.h

sflphone-common/src/dbus/configurationmanager.cpp

sflphone-common/src/managerimpl.cpp

sflphone-common/src/managerimpl.h

sflphone-common/src/preferences.cpp

sflphone-common/src/preferences.h