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If the only thing that is wrong is the encoding of the content, you could do following:
- make a backup of the whole database
- export the content of tables that you want to change
- open the exported file in the tool like Notepad++ change the encoding to UTF-8
- delete the tables from the database
- import back the tables from the file modified in Notepad++
Or you can do it at the MySQL level, but you need to know what you're doing. See
here or
here