It looks like something with rGTWN7fdcd9aa5309: [Collection] Register api message group caused all translations for this extension to be marked fuzzy and therefore no language met the export threshold.

Probably cause of things:

• Message group was split
• For these groups the messages were seen as new -> import page shows a warning and defaults to import and fuzzy

To avoid this from happening again, perhaps default to "import" instead of "import and fuzzy" if the message content is identical.

For now, I think reviewing at least one translation per language should bump these groups over the threshold again. Outdated messages can then be reviewed by translators without time pressure.

Change 748692 had a related patch set uploaded (by Nikerabbit; author: L10n-bot):

[mediawiki/extensions/Collection@master] Localisation updates from https://translatewiki.net.

https://gerrit.wikimedia.org/r/748692

Change 748692 merged by jenkins-bot:

[mediawiki/extensions/Collection@master] Localisation updates from https://translatewiki.net.

https://gerrit.wikimedia.org/r/748692

I did some manual unfuzzying of translators and made a manual export to restore the languages.

There are no deployments to Wikimedia projects this week and only manual deployments next week, so it will take a while until translations are restored there. Per T224922: Code Stewardship Review: Collection Extension there seems to be no owner for this extension to make a call whether an emergency deployment is needed.

Prevention was split into T298022: Solutions to avoid T298009 from happening again.

Change 770686 had a related patch set uploaded (by Abijeet Patro; author: Abijeet Patro):

[mediawiki/extensions/Translate@master] ManageGroups: Select import when key is reused and content is same

https://gerrit.wikimedia.org/r/770686