Some images in the Echo UI must be reversed for RTL languages. Of the images currently in the modules/icons directory, these need to be reversed:
CrossReferenced
Revert
Talk
The ThankYou.png icon in the Thanks extension needs to be reversed, too. Maybe they should be some kind of a generic mechanism for reversing Echo icons.
See Also:
T56276: RTL for Notification Tool: ? should be ؟ icon