Note:

Template - transclusion node

In the ve.ui.CXTransclusionContextItem class, which extends ve.ui.MWTransclusionContextItem for handling transclusion nodes in Content Translation (CX).

Currently, the setup method in ve.ui.CXTransclusionContextItem checks if the transclusion is missing in the target language using this.model.missingInTargetLanguage(). However, this approach doesn't consider the actual source and target languages (target surface) of the translation.

Instead, in the MWTransclusionNode class, the getDescriptionDom method uses a relative link to describe the transclusion, such as:

<a href="/wiki/Vorlage:Infobox_Ort_in_Polen" rel="noopener" target="blank">:Vorlage:Infobox Ort in Polen</a>

This approach doesn't account for the language-specific context of the Content Translation, leading to incorrect transclusions in the target language.
To resolve this issue, we need to modify ve.ui.CXTransclusionContextItem to properly handle transclusion nodes based on the target surface languages of the translation, ensuring that the correct transclusions are displayed or hidden as appropriate.

Initial estimate

Change #1140186 had a related patch set uploaded (by Huei Tan; author: Huei Tan):

[mediawiki/extensions/ContentTranslation@master] POC: Links to templates in CX

https://gerrit.wikimedia.org/r/1140186

Change #1140186 merged by jenkins-bot:

[mediawiki/extensions/ContentTranslation@master] CX: Fix target language for transclusion Context Item

https://gerrit.wikimedia.org/r/1140186