Is there any body having issues when editing attributes labels in a multi store installation?
I believe that method call array_fill
in: \Mage_Adminhtml_Catalog_Product_AttributeController::_filterPostData
is messing around with array keys and as consequence the translations get swapped after saving.
Checking release notes I can see in Other Fixes:
The configuration setting Allow HTML Tags on Frontend is honored.
This make me think that "honoring the setting" introduced this weird behavior.
Btw reverting the offending line to previous version fix the issue.