Added language test.

test/language.test.js

+var chai      = require('chai')
+  , expect    = chai.expect
+  , Sequelize = require(__dirname + '/../index')
+  , Support   = require(__dirname + '/support')
+
+chai.Assertion.includeStack = true
+
+describe(Support.getTestDialectTeaser("Language Util"), function() {
+  describe("Plural", function(){
+    before(function(done) {
+      this.sequelize.options.language = 'es'
+      done()
+    })
+
+    it("should rename tables to their plural form...", function(done){
+      var self = this
+        , table = self.sequelize.define('arbol', {name: Sequelize.STRING})
+        , table2 = self.sequelize.define('androide', {name: Sequelize.STRING})
+
+      expect(table.tableName).to.equal('arboles')
+      expect(table2.tableName).to.equal('androides')
+      done()
+    })
+
+    it("should be able to pluralize/singularize associations...", function(done){
+      var self = this
+        , table = self.sequelize.define('arbol', {name: Sequelize.STRING})
+        , table2 = self.sequelize.define('androide', {name: Sequelize.STRING})
+        , table3 = self.sequelize.define('hombre', {name: Sequelize.STRING})
+
+      table.hasOne(table2)
+      table2.belongsTo(table)
+      table3.hasMany(table2)
+
+      expect(table.associations.androides.identifier).to.equal('arbolId')
+      expect(table2.associations.arboles).to.exist
+      expect(table3.associations.androideshombres).to.exist
+      done()
+    })
+  })
+})