Reason
See T300498: Sunset the LocalisationUpdate extension for more details. Not used much, mostly replaced by translation backports.

The archival should not be started until the MediaWiki branches, where this extension is bundled, fall out of support (expected in September 2023).

To-do list

• This task
  • Add maintainers of that extension/skin as subscribers to this task (if they have no apparent Phabricator account, notify them on-wiki or via email if possible and note it here).
  • Add Phabricator project MediaWiki-extensions-LocalisationUpdate as a tag for this task, and remove MediaWiki-extensions-Other as appropriate.
• On-wiki documentation
  • Archive documentation on mediawiki.org (https://www.mediawiki.org/wiki/Extension:LocalisationUpdate): replace page contents with {{Archived extension|last revision id before archiving|task=T309694}}
  • If documentation page was translatable, remove <translate>, visit Special:PageTranslation, and click "remove from translation" (if you don't have the translation administrator right, ask a user who does).
  • Update Wikidata item (https://www.wikidata.org/wiki/Q21677363) associated with documentation page
    • add statement Abandonware (Q281039) to instance of (P31) together with qualifier start time (P580) = the YYYY-MM-DD date that you decided to archive extension (generally per edit history)
    • add qualifier end time (P582) = the YYYY-MM-DD (same date as above) to instance of (P31) = MediaWiki extension (Q6805426)
• Phabricator
  • Mark all Phabricator tasks for the extension either Declined or Invalid. Add a comment pointing to this task when doing so for reference.
  • Archive Phabricator project MediaWiki-extensions-LocalisationUpdate for the extension.
  • Edit Phabricator project MediaWiki-extensions-LocalisationUpdate description for the extension/skin with a link to this ticket.
• Translatewiki.net/translations
  • Remove from translatewiki.net (groups/MediaWiki/mediawiki-extensions.txt.
• Configuration/tests/integrations/etc.
  • Remove tests in integration/config (zuul/layout.yaml).
  • Remove manifest/other references from mediawiki/vagrant (role::l10update).
  • Remove from https://doc.wikimedia.org/cover-extensions/ (requires Continuous-Integration-Infrastructure shell user to delete directly from the server).
• Repositories
  • Empty repository, leaving only the README indicating the repo is archived, and referring to this task by URL.
  • Remove from mediawiki/extensions (along with in .gitmodules).
  • Mark the repository read-only in Gerrit (also edit description to prepend "[ARCHIVED]" and a reference to this task): (https://gerrit.wikimedia.org/g/mediawiki/extensions/LocalisationUpdate).
  • Archive the Diffusion repository for the extension: rELOC.
  • Delete the GitHub mirror: (https://github.com/wikimedia/mediawiki-extensions-LocalisationUpdate).