add chinese for pages.cn/linux/add-apt-respository.md

pages.cn/linux/apt-file.md

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+# apt-file
+
+> Search for files in apt packages, including ones not yet installed.
+
+- Update the metadata database:
+
+`sudo apt update`
+
+- Search for packages that contain the specified file or path:
+
+`apt-file search {{part/of/filename}}`
+
+- List the contents of a specific package:
+
+`apt-file list {{package_name}}`