In this translation I have only changed "il mio angelo" with "mio angelo", since "moj aniołku" is a vocative.
In Italian we don't have a vocative case, but our "complemento di vocazione" is really close to Latin "vocativus casus", because we don't use any article, neither definite nor indefinite, and it's very common (but not mandatory) to place the possessive adjective after the noun which it is referred to.