Fixed test errors

Cleaned the damage caused by a faulty script run that created a test
error as described in
https://travis-ci.org/web2py/web2py/builds/158680015

applications/welcome/languages/plural-es.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 {
-'actualizada': "['actualizadas']",
-'eliminada': "['eliminadas']",
-'fila': "['filas']",
-'seleccionado': "['seleccionados']",
+'actualizada': ['actualizadas'],
+'eliminada': ['eliminadas'],
+'fila': ['filas'],
+'seleccionado': ['seleccionados'],
 }