system: show the hardware model on the System page

machine.machine_name is already reported in /information.json as hw_ver;
surface it read-only on the System Settings page so the exact build
target is visible in the UI, without adding a redundant JSON field.

html/i18n.js

@@ -138,6 +138,7 @@ var LANG = {
     sys_tab_console: 'Console',
     sys_heading: 'System Settings',
     sys_ip: 'IP address:',
+    sys_model: 'Model:',
     sys_hostname: 'Hostname:',
     sys_apply: 'Apply',
     sys_netmask: 'Netmask:',
@@ -319,6 +320,7 @@ var LANG = {
     sys_tab_console: 'コンソール',
     sys_heading: 'システム設定',
     sys_ip: 'IP アドレス:',
+    sys_model: 'モデル:',
     sys_hostname: 'ホスト名:',
     sys_apply: '適用',
     sys_netmask: 'ネットマスク:',
@@ -500,6 +502,7 @@ var LANG = {
     sys_tab_console: '控制台',
     sys_heading: '系统设置',
     sys_ip: 'IP 地址:',
+    sys_model: '型号:',
     sys_hostname: '主机名:',
     sys_apply: '应用',
     sys_netmask: '子网掩码:',

html/system.html

@@ -30,6 +30,10 @@
         <div class="rcol"> <input id="hostname" type="text" maxlength="23" size="20"/>
           <button onclick="hostSub()" data-i18n="sys_apply">Apply</button></div>
       </div>
+      <div class="row">
+        <div class="lcol"> <label data-i18n="sys_model">Model:</label></div>
+        <div class="rcol"><span id="model"></span></div>
+      </div>
       <div class="row">
         <div class="lcol"> <label for="ip" data-i18n="sys_ip">IP address:</label></div>
         <div class="rcol"> <input id="ip" class="ip" type="text" minlength="7" maxlength="15" size="15"/></div>

html/system.js

@@ -132,6 +132,7 @@ function fetchIP() {
       document.getElementById("netmask").value=s.ip_netmask;
       document.getElementById("gw").value=s.ip_gateway;
       if (document.getElementById("hostname")) document.getElementById("hostname").value = s.hostname || "";
+      if (document.getElementById("model")) document.getElementById("model").textContent = s.hw_ver || "";
       clearInterval(systemInterval);
       // Fetch and populate the config textbox
       fetchConfig().then((configText) => {