I would like to propose MGChecker as the maintainer of Extension:LanguageTag & Extension:InteractiveBlockMessage
There is some easy task, which is about three months ago, yet not merge. MGChecker played a responsible role in other extension's +2 right. So giving him +2 may not be harmful.
https://gerrit.wikimedia.org/r/#/c/406053/
https://gerrit.wikimedia.org/r/#/c/406330/