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

pages.cn/common/transcode.md

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+# transcode
+
+> Transcode video and audio codecs, and convert between media formats.
+
+- Create stabilisation file to be able to remove camera shakes:
+
+`transcode -J stabilize -i {{input_file}}`
+
+- Remove camera shakes after creating stabilisation file, transform video using xvid:
+
+`transcode -J transform -i {{input_file}} -y xvid -o {{output_file}}`
+
+- Resize the video to 640x480 pixels and convert to MPEG4 codec using xvid:
+
+`transcode -Z 640x480 -i {{input_file}} -y xvid -o {{output_file}}`