Comment 9 for bug 1468311

"System updating! Do not disturb in any way, and to keep power plugged."
"系統更新中！請勿干擾並插上外接電源。"
"系统更新中！请勿干扰并插上外接电源。"

Remove an extra space before '!' in en str, and use full width '!' instead in both traditional/simplified Chinese to match the full width period symbol used at the end. My 2 cents.