<prompt> Translate the following text to SwahiliLegend holds that the Kathmandu Valley was once a vast lake, upon which floated a giant lotus flower, from which emanated the light of Swayambhu, the primordial Buddha.  <response>: Kama hadithi inavyosimulia, Bonde la Kathmandu wakati mmoja lilikuwa ziwa kubwa, ambalo lilitandazwa na ua kubwa la lotus, ambalo lilitoka kwa mwangaza wa Swayambhu, Buddha wa awali. 