I had DUPLICATED the normal patch inside the EXTRA folder by mistake, instead putting there the additional patch. With this update that is fixed.
Now the normal patch and the optional patch inside EXTRA folder are different; the second does really replace the enemy names by the Spanish names used in modern translations of Dragon Quest series.
It has been an human mistake.
Here is a complete ROM hack for Rockman 5 which changes all the levels, music, and has graphical edits. Also some of the enemy behavior has been altered.