score:4
You should refer to the detailed guidance in https://www.gov.uk/government/publications/visitor-visa-guide-to-supporting-documents/guide-to-supporting-documents-visiting-the-uk
“If you submit a document that is not in English or Welsh, it must be accompanied by a full translation that can be independently verified by the Home Office. Each translated document must contain:
confirmation from the translator that it is an accurate translation of the original document
the date of the translation
the translator’s full name and signature
the translator’s contact details”
AFAIK, it is not typically necessary to get bank statements translated, given that the information provided is usually self-explanatory - a debit/credit is a debit/credit in any language.
Upvote:-1
Assuming your mother has a Danish passport you shouldn't need a Visa at all. See https://www.gov.uk/check-uk-visa/y/denmark