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First, change to the default theme and test a new registration. I say this because in an earlier post you mentioned trying to add some registration code yourself or something to that affect.
Secondly, and most likely, re-upload all your language files and make sure that the constants and translations are correct. For a test, you can upload the english language files and try to register.
Now, there is a good chance that none of the above will work. Sorry, I just popped online for a quick moment and couldn't leave your post un-answered with good concience.
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