Steps to replicate:
Create a question of type SC or MC and enable feedbacks. Type in 5 or more feedbacks. In question pool, when choosing the detail view of this question, the headings of settings and feedbacks have no translation (screenshot).
When investigating that, I recognized that every item_feedback_* static text field is tried to be translated and a translation error is thrown. With every item_feedback the fallBackLevel is being incremented, so when trying to translate editor.settings this counter is greater than 10 and a translation error is thrown for an existing translation.
I think, this is generally an unwanted behaviour of PackackeTranslator and I suggest to reset the fallBackLevel when a translation error is thrown.
There is also a missing translation for help.hover.metadatas.
The attached patch fixes all that