Allow editing event dates in languages which translate "AM"/"PM"
Summary:
Fixes the bug in the third paragraph of D25861#39133
Depends on D25861
Test Plan: Follow the test plan setup for D25861. Try to edit an event and see that you can now edit it normally and don't get "end date is invalid"/"start date is invalid" errors.
Reviewers: aklapper, O1 Blessed Committers, valerio.bozzolan
Reviewed By: O1 Blessed Committers, valerio.bozzolan
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D26544