emailuser is the generic message used in lists of special pages, etc., so there is no point adding GENDER there. On the actual special page, the title of the page is set to one of the following messages, according to whether there is a target or not:

	"emailuser-title-target": "Email this {{GENDER:$1|user}}",
	"emailuser-title-notarget": "Email user",

As for userrights, the term "user" is used in the context of the noun phrase "user rights management", where it refers to the abstract concept of a user, rather than any individual user, so I don't think the use of GENDER is appropriate here.

In T142316#2531010, @TTO wrote:

emailuser is the generic message used in lists of special pages, etc., so there is no point adding GENDER there. On the actual special page, the title of the page is set to one of the following messages, according to whether there is a target or not:

	"emailuser-title-target": "Email this {{GENDER:$1|user}}",
	"emailuser-title-notarget": "Email user",

As for userrights, the term "user" is used in the context of the noun phrase "user rights management", where it refers to the abstract concept of a user, rather than any individual user, so I don't think the use of GENDER is appropriate here.

Both of this messages actually do refer to individual users, because they also appear under the toolbox when viewing the user's user or talk page.

Change 303406 had a related patch set uploaded (by TTO):
Add GENDER support to email and user rights toolbox links

https://gerrit.wikimedia.org/r/303406

Ah, OK. I didn't realise that. Context is important when referring to messages, as the same message can be used in different places in the UI!

I uploaded a patch that addresses this by creating new messages for use in the sidebar, as well as taking the opportunity to rephrase the user rights message to a more active form.

@TTO, thank you! :)

Currently oppose Emailuser, some languages may ignored "user" in translation, e.g. https://translatewiki.net/wiki/MediaWiki:Emailuser/zh-hans (pinging @YFdyh000 for reason) and https://translatewiki.net/wiki/MediaWiki:Emailuser/lzh

But a lot of languages use different forms for "user" according to the gender. The lack of {{GENDER}} support in this message causes inconvenience.

In T142316#2536582, @Liuxinyu970226 wrote:

Currently oppose Emailuser, some languages may ignored "user" in translation

That's not a reason to oppose this. The language can still choose to translate the message without the word "user" in it; it's not compulsory to actually make use of the GENDER information.

In T142316#2531010, @TTO wrote:

emailuser is the generic message used in lists of special pages

That's the bug actually, message reuse. Probably the message needs to be split, one for the name of the special page and one of the label of a link/action/whatever referring to a specific user.

In T142316#2603440, @Nemo_bis wrote:

That's the bug actually, message reuse. Probably the message needs to be split,

That's what my patch does. Unfortunately, it hasn't received much attention.

In T142316#2603606, @TTO wrote:

In T142316#2603440, @Nemo_bis wrote:

That's the bug actually, message reuse. Probably the message needs to be split,

That's what my patch does. Unfortunately, it hasn't received much attention.

This patch is indeed what should be done.

But a lot of languages use different forms for "user" according to the gender.

Huh? I looked https://translatewiki.net/w/i.php?title=Special%3ATranslations&message=Emailuser&namespace=8 yesterday, and only 6 (es, gl, got, he, pt and sq) have this issue, even fr, ksh, ru and uk are seems not affected, is this still "a lot of languages"?

Change 303406 merged by jenkins-bot:
Add GENDER support to email and user rights toolbox links

https://gerrit.wikimedia.org/r/303406

Thanks for fixing it