cubicweb #153790 generated urls should not contain spaces [deprecated]

the urls that cubicweb produces and that appear in the browser's navigation bar will usually not be recognized by usual parsers (mail programs, text editors ...) as they contain white spaces. But it is a common practice to copy'n'paste that link for further usage. urls containing white spaces might not be understood by users. One should use more usual urls.

done in3.10.0
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