[i18n-activity] Horizontal review discussion planner (#759)

r12a has just created a new issue for https://github.com/w3c/i18n-activity:

== Horizontal review discussion planner ==
_The i18n WG plans to run over https://github.com/w3c/i18n-activity/wiki/i18n-Horizontal-Review-ideas during their meeting at TPAC._

**Objective: check whether we have coherent ideas around how to work with  WGs for horizontal review/support, given our limited resources.**

_Anyone on this list is invited to join the discussion.  We have tentatively planned it for 4pm on Monday. If you want to suggest alternative timing, please chime in here._

Please view or discuss this issue at https://github.com/w3c/i18n-activity/issues/759 using your GitHub account