Do I need to translate my income certificate from the Swedish Embassy for my Non-Thai visa application?

The applicant has a certificate of income from the Swedish Embassy in Bangkok, written in English, and is inquiring if it needs to be translated into Thai and stamped by the Ministry of Foreign Affairs (MFA) for a visa extension application. Responses indicate that translation is generally not required for embassy-certified income documents, but local immigration offices may have varying requirements, including the possibility of needing MFA legalisation and original documents for verification.