Enable ContentTranslation draft purge script [1] with following steps:
[x] 1. Manual dry-run with the `notify-age-in-days` param
Ran:
```
foreachwikiindblist '%% wikipedia.dblist - special.dblist - closed.dblist' extensions/ContentTranslation/scripts/purge-unpublished-drafts.php --age-in-days=455 --notify-age-in-days=425 |& tee -a ~/purgelog-20200826-dry-notify.txt
```
Result: {F32194929}
[x] 2. Manual run with the `notify-age-in-days` param
Result: {F32195902}
[x] 3. Add the `notify-age-in-days` param to the cron run [2]
* Patch to add param: https://gerrit.wikimedia.org/r/622528
[] 4. Check logs in Production after T263438
* T263438 is deployed in Production. Check logs on `mwmaint2002` to confirm that script output is OK.
[1] https://gerrit.wikimedia.org/g/mediawiki/extensions/ContentTranslation/+/eacc96672bd793a40bd57afde5fa11b1fbc997a7/scripts/purge-unpublished-drafts.php
[2] https://gerrit.wikimedia.org/r/plugins/gitiles/operations/puppet/+/refs/heads/production/modules/profile/manifests/mediawiki/maintenance/purge_old_cx_drafts.pp