The prefix BN: has been set up as an alias for the Benutzer: namespace (per the config file). This overrides the interwiki prefix.

I'd suggest to seek community consensus to remove that namespace alias. To be honest, it's hard to see why an alias to the User namespace would be needed.

We should remove the namespace alias. It was never used. "user" can be used as a shorter alias, too. But the bn language code should work.

When we ask for the BN alias in the past nobody thought about Bengali Wikivoyage. But now it became reality.

In T196905#4275938, @RolandUnger wrote:

We should remove the namespace alias.

Could you please post this to the local discussion venue in order to seek consensus? As you observe, I think it is unlikely that there will be objections, but we had better see what the community has to say. Configuration changes like this, small as they may seem, have proven problematic in the past when not supported by consensus.

Today I ask the community to get a consensus to remove the namespace alias bn:

https://de.wikivoyage.org/wiki/Wikivoyage:Lounge#Abschaffung_des_Namensraumk%C3%BCrzels_BN

The voting will take a few days.

Change 440652 had a related patch set uploaded (by Urbanecm; owner: Urbanecm):
[operations/mediawiki-config@master] Remove BN alias for NS_USER on dewikivoyage

https://gerrit.wikimedia.org/r/440652

Seems there's agreement.

Now we have a community consensus. We replaced all BN aliases für NS_USER, too.

In T196905#4297195, @RolandUnger wrote:

Now we have a community consensus. We replaced all BN aliases für NS_USER, too.

Replaced? Or removed?

Replaced by its namespace name ("Benutzer" = "user") that means bn is no longer used as a namespace alias.

Ok, so you want to have namespace alias "BN" dropped without replacement?

In T196905#4298716, @Urbanecm wrote:

Ok, so you want to have namespace alias "BN" dropped without replacement?

Yes, that is what they want.

Yes, BN alias to drop without any replacement.

Change 440652 merged by jenkins-bot:
[operations/mediawiki-config@master] Remove BN alias for NS_USER on dewikivoyage

https://gerrit.wikimedia.org/r/440652

Mentioned in SAL (#wikimedia-operations) [2018-06-25T13:37:16Z] <hashar@deploy1001> Synchronized wmf-config/InitialiseSettings.php: Remove BN alias for NS_USER on dewikivoyage - T196905 (duration: 00m 57s)