First make sure that Moodle's UTF-8 packs for the languages you use are installed. If not you can find them from:
http://download.moodle.org/lang16/
In your Moodle1.6 there is an admin menu under "Languages" in which you will find an utility that allows you to select, download and install these language packs directly from within Moodle.
If this doesn't work, you can install these languages manually into any recent version of Moodle by downloading the zip file below to your hard drive and unzipping it. Uploading the content with your favorite FTP client to a directory called lang in your moodledata directory.
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