some update

client/public/locales/zh/translation.json

@@ -7,7 +7,7 @@
   "tactics": "策略",
   "regular": "标准",
   "relaxed": "休闲",
-  "none": "无",
+  "none": "自由",
   "Rules": "规则",
   "Intro": "介绍",
   "Game Introduction": "游戏介绍",
@@ -15,11 +15,11 @@
   "Start": "开始",
   "Inventory": "定理清单",
   "next level": "下一关",
-  "Next": "下一步",
+  "Next": "下一关",
   "back to world selection": "返回世界选择",
   "Leave World": "离开世界",
   "previous level": "上一关",
-  "Previous": "上一步",
+  "Previous": "上一关",
   "Editor mode is enforced!": "编辑器模式开启！",
   "Editor mode": "编辑器模式",
   "Typewriter mode": "打字机模式",

client/src/components/level.tsx

@@ -466,7 +466,7 @@ function IntroductionPanel({gameInfo}) {
       {gameInfo.data?.worldSize[worldId] == 0 ?
         <Button to={`/${gameId}`}><FontAwesomeIcon icon={faHome} /></Button> :
         <Button to={`/${gameId}/world/${worldId}/level/1`}>
-          Start&nbsp;<FontAwesomeIcon icon={faArrowRight} />
+          {t("Start")}&nbsp;<FontAwesomeIcon icon={faArrowRight} />
         </Button>
       }
     </div>