3 parameters:
1 - Display text - The text used within the tag. If the field is left empty, it will use the default value from the plgcontentbackbutton.ini language file.
2 - Wrap div - Yes/No put a div-tag around the anchor.
3 - Add class to the link - Yes/No adds a backbutton class directly to the a-tag

With regards to Martin Cebulla for extending the translation into German.

I wrote a plugin that adds a button under the TinyMCE editor. From version 1.2.4 package is tested only with Joomla! 2.5+.
Special thanks to Amund Haugsand for translating both plugins for Joomla 1.7+ into Swedish.

Included translations: English, German, Polish, Dutch, Swedish, French, Finnish

Joomla! 1.5.x users:

I released plugin in version 1.1.1. This version improves minor bugs found in version 1.1, new version is downloadable from here:
https://github.com/backbutton/content-plugin/archive/v1.1.1.zip I also released a plugin that adds the button under the TinyMCE editor version 1.0 download from here: https://github.com/backbutton/editor-xtd-plugin/archive/plgeditors-xtdbackbuttonj15v1.0.zip

Included translations: English, German, Polish, Dutch

In matters relating to the use or translations, please contact me on email wojsmol [at] wp [dot] pl or open issue on https://github.com/backbutton/content-plugin/issues