Wrong link for repositories with '+' in the url

Some repositories have '+' on the url. After a search like this one libstdc++: https://archive.softwareheritage.org/browse/search/?q=libstdc%2B%2B&with_visit=true&with_content=true The proposed links send the user on page returning a 404 error : https://archive.softwareheritage.org/browse/origin/directory/?origin_url=http://snapshot.debian.org/package/libstdc%20%20-arm-none-eabi/

If the %20 are replaced with %2B, the repo is found: https://archive.softwareheritage.org/browse/origin/directory/?origin_url=http://snapshot.debian.org/package/libstdc%2B%2B-arm-none-eabi/

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Migrated from T2584 (view on Phabricator)