🎨 i18n: add locale about "font family config"

Note: The language is translated by GPT

app/locales/cn.ts

@@ -156,6 +156,11 @@ const cn = {
       Title: "字体大小",
       SubTitle: "聊天内容的字体大小",
     },
+    FontFamily: {
+      Title: "聊天字体",
+      SubTitle: "聊天内容的字体，若置空则应用全局默认字体",
+      Placeholder: "字体名称",
+    },
     InjectSystemPrompts: {
       Title: "注入系统级提示信息",
       SubTitle: "强制给每次请求的消息列表开头添加一个模拟 ChatGPT 的系统提示",