Add Spanish translation.

languages/CallNumberFirst/es.ini

+A - General Works = "A - Trabajos generales"
+B - Philosophy, Psychology, Religion = "B - Filosofía, psicología, religión"
+C - Historical Sciences = "C - Ciencias históricas"
+D - World History = "D - Historia mundial"
+E - United States History = "E - Historia de los Estados Unidos"
+F - General American History = "F - Historia general americana"
+G - Geography, Anthropology, Recreation = "G - Geografía, antropología, recreación"
+H - Social Science = "H - Ciencias sociales"
+J - Political Science = "J - Ciencias políticas"
+K - Law = "K - Leyes"
+L - Education = "L - Educación"
+M - Music = "M - Música"
+N - Fine Arts = "N - Finas artes"
+P - Language and Literature = "P - Lenguaje y literatura"
+Q - Science = "Q - Ciencia"
+R - Medicine = "R - Medicina"
+S - Agriculture = "S - Agricultura"
+T - Technology = "T - Tecnología"
+U - Military Science = "U - Ciencias militares"
+V - Naval Science = "V - Ciencias navales"
+Z - Library Science = "Z - Ciencias bibliotecológicas"