Hi,
tazx supports the toggle of us and ru keyboard, but not the toggle of us and gr keyboard.
Booting in language Ellinika activates the Greek keymap. So You can't type Latin letters.
I suggest to add add a few lines to tazx to change this in section
# Generate or regenerate 40-Keyboard.conf
case "$keymap" in
---------------
gr)
# Greek
layout="us,gr"
options="grp:ctrl_shift_toggle, grp_led:scroll, compose:ralt, $options" ;;
----------------
The Slovenian part makes no sense to me.
The section
# Add or remove xkb applet from lxpanel
is not working properly, because You can't easily switch at the lxpanel from US to another keyboard. You have it for the user tux but not for user root. I have found it difficult, to repair it in away that it works for both Russian and Greek users toggling only two keyboards. The ctrl_shift_toggle does not need this section, so this section could be deleted, repaired or kept to repair it later.