As per the Documentation Translate to an unsupported language, it states "Request ServiceNow to provide a file containing strings from the interface in the English language".
Please find the attached Zip file for the same.
You need to translate the following columns which are in English needs to replace the corresponding language in the excel file for these categories
and add language code in the Language field.
- Choice: Hint, Label
- Documentation:Hint , Label,Plural,Help
- Translated Field: Label
- Translated Text: value
- Sys_ui_message: Message
The attachment contains German as the example which is needed to be changed to the required Language.