This is a (minor) follow-up in response to comment 54 item 7
Following a pattern of showing a hint as to the value of a setting in a collapsed fieldset or in a vertical tab, the entity translation ui can be improved.
Improve UI by adding hint to add translation: source language collapsed field set
Implement showing the setting hint in the collapsed field set.
User interface changes
No API changes/additions that would affect module, install profile, and theme developers.