Steps to replicate the issue (include links if applicable):
Go to function editor
Add labels for a first language, then labels for second language.
Attempt to publish.

What happens?:
It won't save. There is an error thrown in the network tab: "code: "missingparam", info: "The "zobject" parameter must be set"

What should have happened instead?:
The function should save,

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):