Correct Spanish translations

Author: brammool

src/po/es.po

@@ -16,8 +16,9 @@ msgstr ""
 "Last-Translator: Omar Campagne <[email protected]>\n"
 "Language-Team: vim-doc-es http://www.assembla.com/wiki/show/vim-doc-es\n"
 "MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=utf-8\n"
+"Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: octect-stream\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
 
 msgid "E82: Cannot allocate any buffer, exiting..."
 msgstr "E82: No se pudo asignar memoria para ningún búfer, saliendo..."