For multilingual wikis, such as Wikimedia Commons or Wikidata, it would be nice if all language translations of a namespace name could be entered in the url and be resolved.
It could be a global setting that a wiki could enable.
Perhaps all the language translations could be treated as aliases, in most simple way to do this.
More complex cases are where we have language specific subpages, like if I had http://wikidata.org/wiki/User:Aude/de then it might be nice for http://wikidata.org/wiki/Benutzer:Aude to resolve to there. This is beyond scope of this bug but just some extra consideration.