fix(i18n): fix broken i18n

Author: realth000

lib/i18n/en.i18n.json

@@ -184,10 +184,6 @@
     },
     "behaviorSection": {
       "title": "Behavior",
-      "doublePressExit": {
-        "title": "Double Press Back To Exit",
-        "detail ": "Avoid accidentally exiting the app"
-      },
       "threadReverseOrder": {
         "title": "View posts in reverse order",
         "detail": "In thread, view latest posts first"
@@ -1240,4 +1236,4 @@
     "signature": "Signature",
     "timezone": "Timezone"
   }
-}
+}

lib/i18n/zh-CN.i18n.json

@@ -184,9 +184,6 @@
     },
     "behaviorSection": {
       "title": "行为",
-      "doublePressExit": {
-        "title": "按两下返回才退出应用"
-      },
       "threadReverseOrder": {
         "title": "倒序浏览帖子",
         "detail": "帖子里优先查看最新发布的楼层"