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How will I know that this is what I want ?

You will know it, if you test all the functions in your blog

Why are all these function implemented in one plugin ?

Originally this plugin was written for the homepage of the German Tolkien society (tolkiengesellschaft.de) and all functions were not found elsewhere.

I want the plugin in another language, are there any further translations?

No, this plugin is in English and German only, but you may add this easily translate it. Please contact me if you want to translate this plugin.