refactor: 调整i18n文本目录结构

- 目录调整: i18n文本由单文件改为多文件
- 组件修改: 对应组件内的文本key做出对应修改
- WIP: 其他语言适配逐步完成...

src/locale/zh/page/belt-specification.json

@@ -0,0 +1,23 @@
+{
+  "title": "皮带规格计算",
+  "parameters": {
+    "machine-model": "机器型号",
+    "max-wheelbase": "最大轮距",
+    "hub-diameter": "轮毂直径",
+    "paper-tube-inner-diameter": "纸管内径",
+    "paper-tube-wall-thickness": "纸管壁厚"
+  },
+  "results": {
+    "recommend-belt-thickness": "推荐皮带厚度",
+    "recommend-belt-width": "推荐皮带宽度",
+    "recommend-belt-length": "推荐皮带长度"
+  },
+  "machine-model": {
+    "50_120-series": "50、120系列",
+    "200-series": "200系列",
+    "600-series": "600系列",
+    "PT23-120-series": "PT23-120系列",
+    "PT23-200-series": "PT23-200系列",
+    "custom": "自定义"
+  }
+}