substitution with accented characters

Suppose I have the following text:

Diagonalización de matrices. Formas cuadráticas.
El Espacio Afín
El problema de la Programación Lineal
El Espacio Euclídeo

How can I replace the &#...; with their corresponding characters?

I know that ó is ó
á is á
í is í

The text can be very large with several of the &#...;

Many thanks in advance,

--
Cesar

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