rename manifest tag "Main" -> "Official"

frontend/src/_locales/ja/main.json

@@ -305,6 +305,7 @@
   "Loss is too high, please check the training data, and ensure your gpu driver is up to date.": "Lossが大きすぎます、トレーニングデータを確認し、GPUドライバが最新であることを確認してください。",
   "This version of RWKV is not supported yet.": "このバージョンのRWKVはまだサポートされていません。",
   "Main": "メイン",
+  "Official": "公式",
   "Finetuned": "微調整",
   "Global": "グローバル",
   "Local": "ローカル",

frontend/src/_locales/zh-hans/main.json

@@ -305,6 +305,7 @@
   "Loss is too high, please check the training data, and ensure your gpu driver is up to date.": "Loss过高，请检查训练数据，并确保你的显卡驱动是最新的",
   "This version of RWKV is not supported yet.": "暂不支持此版本的RWKV",
   "Main": "主干",
+  "Official": "官方",
   "Finetuned": "微调",
   "Global": "全球",
   "Local": "本地",