Make the first screen a language choice; Chinese gets the CJK console and zh_CN

The CJK console unpacks Noto Sans Mono CJK from the offline mirror instead
of shipping fonts in the live image, lists only US-keymap keyboards and
preselects Pinyin. The target's LANG comes through locale_config.

test/unit/install-text-zh-test.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 #
-# Every installer text needs an OMARCHY_ZH entry, or a China install shows it in English.
+# Every installer text needs an OMARCHY_ZH entry, or a Chinese install shows it in English.
 
 set -euo pipefail
 
@@ -33,7 +33,7 @@ for text in "${texts[@]}"; do
 done
 printf 'ok - every installer and dashboard text has a Chinese entry\n'
 
-for action in "View full log" "Drop to shell" "Reboot" "Power off" "Upload log for support" "Global" "China"; do
+for action in "View full log" "Drop to shell" "Reboot" "Power off" "Upload log for support"; do
   [[ -n ${OMARCHY_ZH[$action]:-} ]] || fail "labels passed through variables have Chinese entries" "missing: $action"
 done
 printf 'ok - labels passed through variables have Chinese entries\n'