Gutenberg printable form new locale

[anttileppa]

Expected Behavior

Add title to unused locale of printable form, saving should be disabled because all required fields are not filled

Actual Behavior

Save button remains enabled and clicking it causes following error:

An error occurred: {"WebPage":["Required value was not found with language code 'sv'!"],"ServiceChannelDescriptions":["Required value with type 'ShortDescription' was not found with language code 'sv'!","Required value with type 'Description' was not found with language code 'sv'!"]}.

Steps to Reproduce the Problem

1. Embed service with attached
2. Edit service
3. Edit service channels
4. Edit printable form
5. Change locale to previously unused locale
6. Enter title