Wordstics is a WordPress plugin which displays statistics about written content when writing a page or a post. You can see how many words, characters, sentences, words per sentences and characters per word have been written so far, as well as a percentage based on how many words have been written under the “Word count goal”.
The word count goal (as well as the number of sentences) can be changed in the option panel.
Wordstics can be easily translated, an .mo file is included in the lang folder.