fix & opt

- fix duplicated ssh connecting
- opt backup page ui

lib/l10n/intl_en.arb

@@ -119,6 +119,7 @@
     "pingNoServer": "No server to ping.\nPlease add a server in server tab.",
     "backupTip": "The exported data is simply encrypted. \nPlease keep it safe.\nRestoring will not overwrite existing data (except setting).",
     "backup": "Backup",
+    "restore": "Restore",
     "restoreSureWithDate": "Are you sure to restore from {date} ?",
     "backupVersionNotMatch": "Backup version is not match.",
     "invalidJson": "Invalid JSON",

lib/l10n/intl_zh.arb

@@ -117,8 +117,9 @@
     "noInterface": "没有可用的接口",
     "lastTry": "最后尝试",
     "pingNoServer": "没有服务器可用于Ping\n请在服务器tab添加服务器后再试",
-    "backupTip": "导出的数据仅进行了简单加密，请妥善保管。\n恢复的数据（除了设置）不会覆盖现有数据。",
+    "backupTip": "导出的数据仅进行了简单加密，请妥善保管。\n除了设置项，恢复的数据不会覆盖现有数据。",
     "backup": "备份",
+    "restore": "恢复",
     "restoreSureWithDate": "确定恢复 {date} 的备份吗？",
     "backupVersionNotMatch": "备份版本不匹配，无法恢复",
     "invalidJson": "无效的json，存在格式问题",