Add Simplified Chinese as a system language

The installer asks for the language before the keyboard, and
Setup > Language (omarchy language en|zh) switches it later. Under
zh_CN the menu reads its labels from omarchy-menu.zh-cn.jsonc, the
shell from I18nZh.js through I18n.tr, and notifications are worded
by their sender through omarchy-text, which reads the same table.
User text is never translated.

shell/plugins/bar/widgets/Microphone.qml

@@ -1,6 +1,7 @@
 import QtQuick
 import Quickshell
 import Quickshell.Services.Pipewire
+import qs.Commons
 import qs.Ui
 import qs.Commons
 
@@ -57,7 +58,7 @@ BarWidget {
     bar: root.bar
     text: root.muted ? "󰍭" : "󰍬"
     active: root.inUse
-    tooltipText: root.muted ? "Microphone muted" : (root.inUse ? "Microphone in use" : "Microphone live")
+    tooltipText: root.muted ? I18n.tr("Microphone muted") : (root.inUse ? I18n.tr("Microphone in use") : I18n.tr("Microphone live"))
     onPressed: function(b) {
       if (b === Qt.MiddleButton) root.bar.run("omarchy-shell shell toggle omarchy.audio")
       else root.toggleMute()

shell/plugins/bar/widgets/SystemUpdate.qml

@@ -58,7 +58,7 @@ BarWidget {
     bar: root.bar
     text: "\uf021"
     slotSize: Style.bar.statusSlot
-    tooltipText: "Pending Omarchy Updates"
+    tooltipText: I18n.tr("Pending Omarchy Updates")
     onPressed: root.runUpdate()
   }
 }

shell/plugins/bar/widgets/Tray.qml

@@ -411,7 +411,8 @@ BarWidget {
       spacing: Style.space(8)
 
       Text {
-        text: "Tray icons"
+        textFormat: Text.PlainText
+        text: I18n.tr("Tray icons")
         color: root.foreground
         font.family: root.fontFamily
         font.pixelSize: Style.font.body
@@ -419,7 +420,8 @@ BarWidget {
       }
 
       Text {
-        text: "Pinned icons stay visible. Hidden icons never show."
+        textFormat: Text.PlainText
+        text: I18n.tr("Pinned icons stay visible. Hidden icons never show.")
         color: Qt.darker(root.foreground, 1.4)
         font.family: root.fontFamily
         font.pixelSize: Style.font.caption
@@ -429,7 +431,8 @@ BarWidget {
 
       Text {
         visible: root.allItems.length === 0
-        text: "No tray items reporting."
+        textFormat: Text.PlainText
+        text: I18n.tr("No tray items reporting.")
         color: Qt.darker(root.foreground, 1.5)
         font.family: root.fontFamily
         font.pixelSize: Style.font.bodySmall
@@ -486,7 +489,7 @@ BarWidget {
             anchors.verticalCenter: parent.verticalCenter
             anchors.right: parent.right
             iconText: "\uf08d"
-            text: rowRoot.isPinned ? "Unpin" : "Pin"
+            text: rowRoot.isPinned ? I18n.tr("Unpin") : I18n.tr("Pin")
             foreground: root.foreground
             horizontalPadding: 8
             verticalPadding: 3
@@ -501,7 +504,7 @@ BarWidget {
             anchors.right: rowPinBtn.left
             anchors.rightMargin: Style.space(6)
             iconText: "\uf06e"
-            text: rowRoot.isHidden ? "Show" : "Hide"
+            text: rowRoot.isHidden ? I18n.tr("Show") : I18n.tr("Hide")
             foreground: root.foreground
             horizontalPadding: 8
             verticalPadding: 3