Emailed Author: Since this is a fork, you have a couple things you need to do:
1) Have your plugin check for qtranslate and fail to activate if it's active. This will prevent crashes.
2) Rename functions to ztranslate names to prevent collisions.
3) Change the text domain from qtranslate to ztranslate (see http://ottopress.com/2013/language-packs-101-prepwork/ )
4) Update the readme to explain this is a fork and that you are the new maintainer.
5) Remove all links like http://www.qianqin.de/qtranslate/installation-guide and change them to your own.
You don't need to rename files, but you should re-package the languages.
Please send a link so the completed plugin can be downloaded. Alternately you can reply to this and send a .zip file. Note: We would like you to send the whole plugin, not just the readme, as we will re-review your entire code as a whole.
As this is for a new plugin request, please reply within seven days of this email or we will reject your plugin.