Reason
Parts of the code have security risks such as unescaped parameters that allow for possible XSS vulnerabilities. The maintainer has not contributed to the code since 2012. Since no one has stepped up to fix this code base and usage seems low, archival is the best route. See more in T309255

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 OfflineImportLexicon as a tag for this task, and remove MediaWiki-extensions-Other/Other-skins as appropriate.
• On-wiki documentation
  • Archive documentation on mediawiki.org (https://www.mediawiki.org/wiki/Extension:OfflineImportLexicon): replace page contents with {{Archived extension|4305771|task=T313860}}
  • Update Wikidata item (https://www.wikidata.org/wiki/Q21677845) 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/skin (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/skin either Declined or Invalid. Add a comment pointing to this task when doing so for reference.
  • Archive Phabricator project OfflineImportLexicon for the extension.
  • Edit Phabricator project OfflineImportLexicon 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).
• 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/OfflineImportLexicon).
  • Archive the Diffusion repository for the extension/skin: (rEOIL).
  • Delete the GitHub mirror: (https://github.com/wikimedia/mediawiki-extensions-OfflineImportLexicon).