Added a feature to save logs to local storage (#1741)

- Added export logs to local storage
[1664](https://github.com/tiann/KernelSU/issues/1664)

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Co-authored-by: weishu <twsxtd@gmail.com>

manager/app/src/main/res/values-zh-rHK/strings.xml

@@ -120,4 +120,5 @@
     <string name="shrink_sparse_image">最小化稀疏影像</string>
     <string name="shrink_sparse_image_message">將模組所在的稀疏影像調整為實際大小。 請注意，這可能會導致模組工作異常，因此請僅在必要時使用（例如備份）</string>
     <string name="settings_uninstall">解除安裝</string>
+    <string name="save_log">保存日志</string>
 </resources>