baselang can be specified when creating the wish

That was the plan all along, but some felt a language selector in the form might be confusing. Perhaps we should show it only when the user interface language differs from the site language.

and can be corrected afterwards.

I'm hoping with the language selector in the form on initial creation, the need to correct the language will be lessened. Changing the page language is something only sysops and translation-admins are supposed to be able to do (pagelang user right).

Pppery is a sysop and translation admin. The problem is that his edit didn't stick after your edit with the form.

Perhaps we should show it only when the user interface language differs from the site language.

I'm not sure if this is a good idea. Not all of the users who are comfortable reading English UI (or whose first language doesn't have good translation of the UI) will be comfortable writing their wishes in English.

Change #1207208 had a related patch set uploaded (by MusikAnimal; author: MusikAnimal):

[mediawiki/extensions/CommunityRequests@master] Invalidate cache when changing lang, and make base_lang rewritable

https://gerrit.wikimedia.org/r/1207208

Change #1207208 merged by jenkins-bot:

[mediawiki/extensions/CommunityRequests@master] Invalidate cache when changing lang, and make base_lang rewritable

https://gerrit.wikimedia.org/r/1207208

Back to in-dev to take care of the "Language" input in the form.

I've manually changed the language twice: on https://meta.wikimedia.org/wiki/Community_Wishlist/W484 and https://meta.wikimedia.org/wiki/Community_Wishlist/W481. In both cases the result seems to have been that the wish vanished entirely from wish lists. Has something gone wrong here?

Apparently the next edit with the form causes the wish to manually reappear, but still not good.

In T409992#11456432, @Pppery wrote:

I've manually changed the language twice: on https://meta.wikimedia.org/wiki/Community_Wishlist/W484 and https://meta.wikimedia.org/wiki/Community_Wishlist/W481. In both cases the result seems to have been that the wish vanished entirely from wish lists. Has something gone wrong here?

@Pppery are you still able to replicate your issue above?

I fixed those two specific cases by making a dummy edit with the form (see T409992#11457294). Since there aren't any wishes on Meta that I want to change the language of right now there's nothing for me to test, but I would be surprised if the issue resolved itself.

@Pppery I tested the issue described in this task, and I verified the patch submitted by @MusikAnimal addressed the ability to correct the wish language. I was unable to replicate the case where the edit causes the wish to disappear from the wishlist.

Is it safe to say that we can resolve this task and open a new one if we notice that wishes are disappearing after edits?

Fine in principle with waiting for the disappearing issue to recur and closing, but T409992#11403408 still needs to be done, right?

We'll have QA review this task, and I have opened a new task T414395 to address the language field in the edit form.

As the task title and description make clear, specifying the language is one of the requirements, so I'm at a loss as to why it's already at QA.