@Soul_Train: Thanks for reporting this. For future reference, please use the bug report form (linked from the top of the task creation page) to create a bug report.
Let's see what we have...

• https://alt.wikipedia.org/wiki/Участница:Bakpay "works" (but is not wanted).
• https://alt.wikipedia.org/wiki/Туружаачы:Bakpay redirects to https://alt.wikipedia.org/wiki/Участница:Bakpay
• https://alt.wikipedia.org/wiki/User:Bakpay redirects to https://alt.wikipedia.org/wiki/Участница:Bakpay

• https://alt.wikipedia.org/wiki/Туружаачы:Толуш also "works". Hmm.
• https://alt.wikipedia.org/wiki/Участница:Толуш redirects to https://alt.wikipedia.org/wiki/Туружаачы:Толуш
• https://alt.wikipedia.org/wiki/User:Толуш redirects to https://alt.wikipedia.org/wiki/Туружаачы:Толуш

• https://noc.wikimedia.org/conf/InitialiseSettings.php.txt only lists 'Участница' => NS_USER for ruwiki. altwiki has no such entry here.
• https://alt.wikipedia.org/w/api.php?action=query&meta=siteinfo&siprop=namespaces&formatversion=2 lists "Туружаачы" for the User namespace 2.

• In MediaWiki core, we have ./languages/messages/MessagesAlt.php: NS_USER => 'Туружаачы',

This makes me wonder if maybe namespaceDupes.php (?) wasn't run after T271981 to update existing accounts (?) from (Russian) language fallback chains.

Change 716017 had a related patch set uploaded (by Umherirrender; author: Umherirrender):

[mediawiki/core@master] Remove russion gender aliases from MessagesAlt

https://gerrit.wikimedia.org/r/716017

Thats how language fallback works in mediawiki. It also shows the gender support from russian in the languages using russian as fallback.

It is possible to remove the gender aliases, like done in some other languages with fallback of russian. I have uploaded a patch set.

By the way, when we switch to the Altai interface/language in “Preferences/User profile”, there is no form for “Use feminine terms when possible (e.g. "her contributions")”, only “Unspecified” and “Use masculine terms when possible (e.g. "his contributions")” — I think its another bug, but you should know.

In T290163#7326030, @Soul_Train wrote:

By the way, when we switch to the Altai interface/language in “Preferences/User profile”, there is no form for “Use feminine terms when possible (e.g. "her contributions")”, only “Unspecified” and “Use masculine terms when possible (e.g. "his contributions")” — I think its another bug, but you should know.

The translation for both genders are the same, which makes it fail to display:

	"gender-male": "Ол вики бӱктерди тӱзедет",
	"gender-female": "Ол вики бӱктерди тӱзедет",

Please adjust the translation on translatewiki.net

• https://translatewiki.net/wiki/MediaWiki:Gender-male/alt
• https://translatewiki.net/wiki/MediaWiki:Gender-female/alt

Please adjust the translation on translatewiki.net

• https://translatewiki.net/wiki/MediaWiki:Gender-male/alt
• https://translatewiki.net/wiki/MediaWiki:Gender-female/alt

Thank you, I have corrected it according to the dictionary, but tomorrow native speakers will look and clarify the translation.

In T290163#7325982, @Umherirrender wrote:

Thats how language fallback works in mediawiki. It also shows the gender support from russion in the languages using russion as fallback.

@Umherirrender: Ah, thanks a lot! I'm still surprised why User:X sometimes redirects to Туружаачы: and sometimes to Участница: though (if you have a spare minute to share your knowledge).

Change 716017 merged by jenkins-bot:

[mediawiki/core@master] Remove Russian gender aliases from MessagesAlt.php

https://gerrit.wikimedia.org/r/716017

In T290163#7328504, @Aklapper wrote:

In T290163#7325982, @Umherirrender wrote:

Thats how language fallback works in mediawiki. It also shows the gender support from russion in the languages using russion as fallback.

@Umherirrender: Ah, thanks a lot! I'm still surprised why User:X sometimes redirects to Туружаачы: and sometimes to Участница: though (if you have a spare minute to share your knowledge).

Туружаачы is the translation for user namespace for lang=alt. It is also used for the unknown gender, while Участница is the female gender alias (from lang=ru) and is used for users which have changed the gender preference to female.
The user pages reflects the gender in the namespace part when linking.

$namespaceGenderAliases = [
	NS_USER      => [ 'male' => 'Участник', 'female' => 'Участница' ],
	NS_USER_TALK => [ 'male' => 'Обсуждение_участника', 'female' => 'Обсуждение_участницы' ],
];

$namespaceNames = [
  ...
	NS_USER             => 'Туружаачы',
	NS_USER_TALK        => 'Туружаачыны_шӱӱжери',
  ...
];

https://www.mediawiki.org/wiki/Manual:$wgExtraGenderNamespaces

The extra for this task is that lang=alt has lang=ru as fallback language and every i18n part which is not in lang=alt is used from lang=ru, like messages, missing translation for special pages or magic words, the dateformats, number formats, link trail and the gender namespace alias. Or from the default fallback lang=en, when lang=ru does not define something (like language converter, plural and grammar specials)

Ah, thanks so much. Very appreciated!

@Umherirrender Hi, I'm not sure if I understand the status of this task correctly -- is there something that still needs to be done?

I see this task is tagged Wikimedia-maintenance-script-run, I'm not sure why. namespaceDupes.php was mentioned few comments above; there are no changes that this script would perform if ran, see dry run below:

[urbanecm@mwmaint2002 ~]$ mwscript namespaceDupes.php --wiki=altwiki
0 pages to fix, 0 were resolvable.

0 links to fix, 0 were resolvable, 0 were deleted.

Looks good!
[urbanecm@mwmaint2002 ~]$

My patch is part of wmf/1.37.0-wmf.22, but there is no deployment yet - https://www.mediawiki.org/wiki/MediaWiki_1.37/Roadmap

I would not expect the script to be needed after the deployment, but it should not hurt to be safe.