fix(system,x11): set system-wide TERM=xterm-256color and C.UTF-8 locale

overlay/rootfs/usr/bin/bananarchy-x11-session.sh

@@ -21,6 +21,11 @@ export EDITOR=nano
 export VISUAL=nano
 export PAGER="less -RXF"
 export LESS="-RXF"
+export TERM=xterm-256color
+export CHARSET=UTF-8
+export LANG=C.UTF-8
+export LC_ALL=C.UTF-8
+export LC_COLLATE=C.UTF-8
 export SXMO_DISABLE_LEDS=1
 export SXMO_NO_VIRTUAL_KEYBOARD=1
 export NO_AT_BRIDGE=1

overlay/rootfs/usr/bin/sxmo_terminal.sh

@@ -3,6 +3,11 @@
 # Copyright 2022 Sxmo Contributors
 # shellcheck disable=SC2086
 
+export TERM=xterm-256color
+export CHARSET=UTF-8
+export LANG=C.UTF-8
+export LC_ALL=C.UTF-8
+
 SXMO_TERMINAL="${SXMO_TERMINAL:-st}"
 
 if [ -z "$*" ]; then