fix: update changelog & backup restore

lib/l10n/app_en.arb

@@ -11,7 +11,7 @@
   "backDir": "Back",
   "backup": "Backup",
   "backupAndRestore": "Backup and Restore",
-  "backupTip": "The exported data is simply encrypted. \nPlease keep it safe.\nRestoring will not overwrite existing data.",
+  "backupTip": "The exported data is simply encrypted. \nPlease keep it safe.",
   "backupVersionNotMatch": "Backup version is not match.",
   "bgRun": "Run in backgroud",
   "cancel": "Cancel",

lib/l10n/app_zh.arb

@@ -11,7 +11,7 @@
   "backDir": "返回上一级",
   "backup": "备份",
   "backupAndRestore": "备份和恢复",
-  "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。",
   "backupVersionNotMatch": "备份版本不匹配，无法恢复",
   "bgRun": "后台运行",
   "cancel": "取消",