The parameterize method is supposed to provide a secure URL for the string and there is a strict limit on what characters can be displayed in the URL. Usually nothing is shy about az or 0-9 or - .
You can always try and fix this so that by default multibyte UTF-8 characters are entered. The current implementation is really not enough. Instead of allowing only a small set of specific characters, a more robust version will highlight unpleasant ones.
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