External System Importer CSV option is not working for all latin or cyrillic languages (french , spanish, portuguesh, italian, russian...) but it still works using the None option instead of CSV

If the JIRA user's personal setting is using a latin or cyrillic language as the user's language preference, the External System Importer CSV option is not working, it will show a message about "inactive users within JIRA that need to be activated to process the import and ask to grant Global JIRA Users Permissions to the following CSV users before trying again to process the import". However, once this message is showed, the Next button will be greyed after uploading the file or after clicking anywhere (reproduced it for french, spanish, italian, portuguese).

Also, choosing None of these instead of CSV works as a workaround as the None option redirect to the CSV importer but without facing this bug. The CSV option works as expected with all the other languages settled within the personal settings.

Seems similar to another bug JRACLOUD-69790: CSV External system import in Spanish is not working if uploaded file contains non-ASCII characters, but the file encoding is set to UTF-8 not ASCII, so it's not an encoding inconsistency and it still works using the External System Importer None of these option instead of the CSV, which still redirect to the CSV file importer but without facing this message and this bug.

Step to reproduce

1. Go to the personal setting
2. Choose a latin or cyrillic language (e.g. french / spanish / italian / portuguese)
3. Go to System > External System Importer > CSV
4. Upload a CSV file

Expected Result
Able to click Next and run a CSV file import.

Actual Result
Next is greyed and the CSV file can't be imported.

Workaround

• Change the personal settings in order to use another language than a latin's one.
• Use the None of these option from the External System Importer to run the CSV import.