Hooray! ) Just tested a migration from 1.0.2 on an empty site. Everything is fine, except the notice mentioned above.
BTW, I’ve rebuilt generic .pot file core_en via makepot.php and translated everything from “Security page” and other new strings into Russian. Don’t know how to deal all this further (e.g. GitHub issue, or #i18n on Slack, or something), so for now I’ll temporary put .po and .mo files in my Google Drive.
Tested visually, seems ok.
Please, let me know if I should treat those files in any other way in future.
