Which language must documents be translated into for an internship or exchange visa for Sweden, and who may certify them?

In brief, before the detail — the most common reasons visa supporting documents get returned are: name spelling that differs from the passport page, Thai/Gregorian date mismatches, unclear official seals or signatures, and certificates issued too long before submission. We check all four before filing and supply an indexed document schedule so the officer can verify each item quickly. Note: the approval decision belongs to the destination authority; our role is to make the document set correct and complete.