Esplendor translates to "splendor" or "magnificence". It's a beautiful, poetic word that you won't hear in everyday conversation, making it a special addition to your vocabulary.
In the song, Carla Morrison offers her lover not just physical things, but "todo mi esplendor" (all my splendor). She's offering the entirety of her magnificent being and the brilliance of her love, making it a deeply romantic and powerful statement.
Carla Morrison's "Te Regalo" is one of the most direct and beautiful declarations of love you'll ever hear. The title itself means "I give you as a gift," and she spends the whole song listing the things she wants to give to her partner. It's not about material things. Instead, she offers total support and comfort, singing, "Te regalo mis piernas / Recuesta tu cabeza en ellas" (I give you my legs / Rest your head on them) and "Te regalo mis fuerzas / Úsalas cada que no tengas" (I give you my strength / Use it whenever you don't have any). She wants to take care of this person completely, both physically and emotionally.
The song builds on this idea of giving everything of herself. She offers up the very core of her being with the line, "Te regalo las piezas / Que a mi alma conforman" (I give you the pieces / That make up my soul). Her goal is simple: to ensure "Que nunca nada te haga falta a ti" (That you never lack for anything). The song's ultimate promise is repeated over and over, making it clear this isn't a temporary feeling: "Te voy a amar hasta morir" (I'm going to love you until I die).