Steps to reproduce:
- Go to Content & Data > Forms;
- Click to add a new form;
- Add a Select from List field and insert two manual options;
- Publish the form;
- Add a new translation;
- Translate all the values (title, field name and its options);
- Save the form;
- Enter the field's settings again and try to include a new option.
The user is able to include a new option and save the form successfully afterwards.
On 7.2.x: browser's console shows error message and new option is not persisted.
On 7.1.x: you can add the option, but, when you click to save the form, Liferay shows a generic error message instead of a success one.