When copying content from my Microsoft Excel file (attached) with answer code, English translation and Spanish translation, everything works fine when using the quick add feature at question level. I simply copy-paste all the three columns and the answer labels are saved correctly for both languages.

When doing the same for a label set using English and Spanish language and the quick add feature to copy-paste the same content, there is an issue when saving the data. If you just copy-paste the content and then preview the Spanish labels before saving, everything looks correct, but once you have clicked save, the Spanish translation shows English labels only, see screenshots.