hi guys,
I hope I am not too late to help!
I live in Spain and do a lot of spanish sites in modx and there are a few problems.
I have uploaded a zip, it contains 3 spanish language files, 1 for each of these locations:
/manager/includes/lang
/snippets/ajaxSearch/lang
/snippets/eform/lang
each file´s title is appended with something like "_forManager_" to let you know which one goes where. From what you wrote I think currently you only need the "_forManager" one but I included the others just in case you come across some other problems.
Here´s an example of what modx 1.0 has in the eform spanish language file:
Su informaciÛn ha sido enviada con Èxito.
I have changed to:
Su información ha sido enviada con éxito.
the ajaxSearch file is the same thing.
If you use any of these files I recommend keeping the originals in place but renaming them to old_ or something so if anything goes wrong you can revert! Shouldn´t have any problems tho, just to let you know I never had your problem of the chars with accents getting cut out, the problem I had was á would get replaced with an ? still, I now have accents displaying fine in the manager with 1.0.
Let me know how it goes, suerte.
Dan