1. improvement: Also automatically remove empty-like folders containing only .DS_Store or Thumbs.db.
2. feature: Add a checkbox in the preferences to configure whether to treat slashes / as subfolder delimiters. This feature introduced in #13 is inappropriate for some cases; for instance, IEEE/ACM Transactions on Networking should not be split into subfolders.
3. locale: Add German translation.
4. fix: Fix the failure of moving files due to PathUtils.join being unable to join a path with another relative path.

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1. 改进: 自动移除仅包含 .DS_Store 或 Thumbs.db 的空文件夹。
2. 功能: 添加一个配置选项，用于选择是否将项目字段中的斜杠 / 视为子文件夹分隔符。由于 #13 引入的这个新特性对部分用户并不合适，例如期刊《IEEE/ACM Transactions on Networking》不应当被切分。
3. 本地化: 添加德语翻译。
4. 修复: 修正由于 PathUtils.join 无法将一个路径与另一个相对路径拼接导致的文件移动失败。