browse_helper: Correctly link to wiki pages whose keys or values contain spaces
browse_helper: Correctly link to wiki pages whose keys or values contain spaces

The update-wiki-pages script normalizes " " to "_" (since MediaWiki
does it by design), but I didn't normalize it back in the
browse_helper.

Consequently objects with tags like "source=Isle of Man Government
aerial imagery (2001)" were never linked to the wiki correctly.

tillmo/do-roam,tillmo/do-roam,tillmo/do-roam,tillmo/do-roam,tillmo/do-roam,tillmo/do-roam