Isaiah 14:12 VS Revelation 22:16

Lucifer is a name frequently given to the Devil in Christian belief. This usage as a reference to a fallen angel stems from a particular interpretation of Isaiah 14:3-20,a passage that speaks of someone who is given the name of "Day Star" or "Morning Star" (in Latin, Lucifer) as fallen from heaven. 2 Peter 1:19 and elsewhere, the same Latin word lucifer is used of the morning star with no relation to the devil. However, in writings later than those in the Bible, the Latin word Lucifer has often been used instead as a proper name for the devil (by Wikipedia).

Isaiah 14:12
"How you are fallen from heaven,
   O Day Star,son of Dawn!
How you are cut down to the ground,
   you who laid the nations low!"

(Yesaya 14:12  "Wah, Engkau sudah jatuh dari langit, hai BINTANG TIMUR, putera Fajar, engkau sudah dipecahkan dan jatuh ke bumi, hai yang mengalahkan bangsa-bangsa!")

Revelation 22:16
"I, Jesus, have sent my angel to testify to you these things in the churches. I am the Root and the Offspring of David, the Bright and Morning Star."

(Wahyu 22:16 >> "Aku, yesus, telah mengutus malaikat-malaikatKu untuk meberi kesaksian tentang semuanya ini kepadamu bagi jemaat-jemaat. Aku adalah tunas, yaitu keturunan daud, BINTANG TIMUR yang gilang gemilang")

Could somebody please expalin it to me????