…space

Your checklist for this pull request

• I've read the contributing guideline.
• I've tested my changes by building and running the project, and testing changed functionality (if applicable)
• I've added automated tests for my change (if applicable, optional)
• I've updated documentation to reflect my change (if applicable)

What is the current/new behaviour?

Yet another encoding maze:

Markdown doesn't render links that contain space [name](/q=attr:"my value")

It means we should use URI-encoding for these links, but React-Router's Link expects non-encoded part URI, so we need to decode it before passing to Link