Mozart's instrument data base can be used with instrument names in any language. The names are used for constructing stave labels (if you wish) and providing a default text instruction when a player changes instrument.
In early editions of Mozart 9, the options UK English, US English, French, and German were originally supplied.
Here, thanks to a translation by Iván Mendieta in the Republic of Panamá, is a version in Spanish.
To install it: just download the file (eg right click on this link and "save target as"), and put it together with the existing instrument.??.txt files in the data folder within your MOZART 9 program folder (typically C:\Program Files\Mozart9\Data or equivalent).
Mozart 9 will find it there, and the Spanish option will be added to the list of instrument languages found on the "languages" page of the "global preferences" dialogue box, available from Mozart 9's menus.