| Krinkle added a comment. |
@Jonas The uselang-hacks represent a legacy feature for the community, originally for Commons but probably other wikis as well. Examples:
- https://commons.wikimedia.org/w/index.php?title=Commons:Hochladen&uselang=de
- https://commons.wikimedia.org/wiki/Commons:Upload
In T204791#4622102, @gerritbot wrote:[mediawiki/extensions/Wikibase@master] When an invalid language code is requested use 'und' instead
https://gerrit.wikimedia.org/r/463264
I'm familiar with und but have not seen it before MediaWiki context. I may've missed it, but if it is true, then we should probably avoid introducing it in just one area like this – Under the "principle of least surprise", and more generally to reduce inconsistencies and things that can go wrong, or are different without significant benefit (given that consistency is a big benefit, one we would lose). If it is unused and Wikibase does use it, I would recommend documenting the reasoning of this trade-off and filing a task with plan for how/when to resolve the technical debt. You'll want to talk to Wikimedia's Language Engineering team about what the recommended alternatives would be.
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