I'm writing a document with and abstract and I've set the language to Spanish, and so the abstract environment displays the word "Resumen" instead of "Abstract". I want the opposite. I've tried
The first does nothing and the second displays the word Abstract but removes the bold font, puts it in the beginning of the line and the abstract text displays just after it, something like:
Abstract. This is the abstract...
How should I properly change it? The class document is
Thanks in advance