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That all documents must be in English and that translations must be certified is not optional. The UK Visa & Immigration supporting documents guide is emphatic on that point:
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:
As it also point out, submission of these documents does not guarantee that your application will be successful. However, disregarding that requirement, on the advice of those to whom it may not apply, risks a refusal.