Based upon Shir Hashirim:
Mi ban = The One (Hashem) who understands
siach shoshan chochim = the speech of his nation known as the rose among thorns
Ahavas kallah = the love of a kallah (Klal Yisroel linking with the Torah and Hashem)
Mesos dodim = the joy of lovers (Klal Yisroel linking with Torah and Hashem)
Hu yivareich = He should bless (second the motion of the Sheva Brachos. We can say Sheva Brachos all we want but unless Hashem signs on the deal, nothing doing)
Translate the song the way you learn Shir Hashirim. If you think Shir Hashirim can simply be translated without explanation, think again!