Magical Wishing Tool

If I was offered a magic wishing language imprinter, that would imprint full knowledge of a language, written, oral and aural, into my head within 45 seconds but which would give me a splitting headache for 48 hours afterwards, I'd take it. Two solid weeks of cranial agony in exchange for total fluency in Japanese, Welsh, Mandarin Chinese, Korean, Italian, Portuguese and German? Sign me up, and pass me those ice packs.