diff --git a/client/client/src/addresses/addresses.html b/client/client/src/addresses/addresses.html
index c1e4cc54f..a8b63f2b3 100644
--- a/client/client/src/addresses/addresses.html
+++ b/client/client/src/addresses/addresses.html
@@ -11,7 +11,7 @@
                     <vn-horizontal style="align-items: center;">
                         <vn-none pad-medium-h style="color:#FFA410;">
                             <i class="material-icons" ng-if="i.isDefaultAddress">star</i>
-                            <i class="material-icons pointer" ng-if="!i.isDefaultAddress&&i.isActive" vn-tooltip="Set as default" tooltip-position="left" ng-click="$ctrl.setDefault(i.id)">star_border</i>
+                            <i class="material-icons pointer" ng-if="!i.isDefaultAddress" vn-tooltip="Set as default" tooltip-position="left" ng-click="$ctrl.setDefault(i.id)">star_border</i>
                         </vn-none>
                         <vn-one>
                             <div><b>{{::i.nickname}}</b></div>
@@ -27,9 +27,7 @@
             </vn-horizontal>
         </vn-vertical>
     </vn-card>
-    
     <vn-paging index="index" total="index.model.total"></vn-paging>
-    
     <vn-float-button
         fixed-bottom-right
         ui-sref="clientCard.addresses.create"
diff --git a/services/auth/server/model-config.json b/services/auth/server/model-config.json
deleted file mode 100644
index 1a90e6637..000000000
--- a/services/auth/server/model-config.json
+++ /dev/null
@@ -1,27 +0,0 @@
-{
-  "user": {
-    "dataSource": "salix"
-  },
-  "AccessToken": {
-    "dataSource": "salix",
-    "relations": {
-      "user": {
-        "type": "belongsTo",
-        "model": "user",
-        "foreignKey": "userId"
-      }
-    }
-  },
-  "ACL": {
-    "dataSource": "salix"
-  },
-  "RoleMapping": {
-    "dataSource": "salix"
-  },
-  "Role": {
-    "dataSource": "salix"
-  },
-  "Account": {
-    "dataSource": "account"
-  }
-}
\ No newline at end of file
diff --git a/services/client/common/models/agency-mode.json b/services/client/common/models/agency-mode.json
index f873edace..ebac22a77 100644
--- a/services/client/common/models/agency-mode.json
+++ b/services/client/common/models/agency-mode.json
@@ -1,5 +1,6 @@
 {
   "name": "AgencyMode",
+  "description": "Agency modes",
   "base": "VnModel",
   "options": {
     "mysql": {
diff --git a/services/client/common/models/client-credit.json b/services/client/common/models/client-credit.json
index 1d5409953..96ea26829 100644
--- a/services/client/common/models/client-credit.json
+++ b/services/client/common/models/client-credit.json
@@ -1,5 +1,6 @@
 {
   "name": "ClientCredit",
+  "description": "Log of credit changes",
   "base": "VnModel",
   "options": {
     "mysql": {
diff --git a/services/client/common/models/client-observation.json b/services/client/common/models/client-observation.json
index b1cd33ab5..47654b134 100644
--- a/services/client/common/models/client-observation.json
+++ b/services/client/common/models/client-observation.json
@@ -1,6 +1,6 @@
 {
   "name": "ClientObservation",
-  "description": "Notas de los clientes.",
+  "description": "Client notes",
   "base": "VnModel",
   "options": {
     "mysql": {
diff --git a/services/client/common/models/company.json b/services/client/common/models/company.json
index e3cd32353..d3700bad6 100644
--- a/services/client/common/models/company.json
+++ b/services/client/common/models/company.json
@@ -1,5 +1,6 @@
 {
     "name": "Company",
+    "description": "Companies",
     "base": "VnModel",
     "options": {
       "mysql": {
diff --git a/services/client/server/i18n/en.json b/services/client/server/i18n/en.json
deleted file mode 100644
index a62e31b81..000000000
--- a/services/client/server/i18n/en.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-    "Hello": "Hello english"
-}
\ No newline at end of file
diff --git a/services/client/server/i18n/es.json b/services/client/server/i18n/es.json
deleted file mode 100644
index 0ef9e258e..000000000
--- a/services/client/server/i18n/es.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-    "Hello": "Hola español"
-}
diff --git a/services/client/server/model-config.json b/services/client/server/model-config.json
index cbc7cc47d..fa5453206 100644
--- a/services/client/server/model-config.json
+++ b/services/client/server/model-config.json
@@ -1,63 +1,14 @@
 {
-  "user": {
-    "dataSource": "salix"
-  },
-  "AccessToken": {
-    "dataSource": "salix",
-    "relations": {
-      "user": {
-        "type": "belongsTo",
-        "model": "user",
-        "foreignKey": "userId"
-      }
-    }
-  },
-  "ACL": {
-    "dataSource": "salix"
-  },
-  "RoleMapping": {
-    "dataSource": "salix"
-  },
-  "Role": {
-    "dataSource": "salix"
-  },
-  "Account": {
-    "dataSource": "account"
-  },
-  "Client": {
+  "AgencyMode": {
     "dataSource": "vn"
   },
   "ClientCredit": {
     "dataSource": "vn"
   },
-  "ClientCreditLimit": {
-    "dataSource": "vn"
-  },
   "ClientObservation": {
     "dataSource": "vn"
   },
-  "PayMethod": {
-    "dataSource": "vn"
-  },
-  "Address": {
-    "dataSource": "vn"
-  },
-  "AgencyMode": {
-    "dataSource": "vn"
-  },
-  "Province": {
-    "dataSource": "vn"
-  },
-  "Country": {
-    "dataSource": "vn"
-  },
-  "ContactChannel": {
-    "dataSource": "vn"
-  },
-  "Worker": {
-    "dataSource": "vn"
-  },
-  "CreditClassification": {
+  "Company": {
     "dataSource": "vn"
   },
   "Greuge": {
@@ -71,8 +22,5 @@
   },
   "MandateType": {
     "dataSource": "vn"
-  },
-  "Company": {
-    "dataSource": "vn"
   }
 }
diff --git a/services/item/server/model-config.json b/services/item/server/model-config.json
index 8380de2bf..0b8ca815e 100644
--- a/services/item/server/model-config.json
+++ b/services/item/server/model-config.json
@@ -1,29 +1,4 @@
 {
-  "user": {
-    "dataSource": "salix"
-  },
-  "AccessToken": {
-    "dataSource": "salix",
-    "relations": {
-      "user": {
-        "type": "belongsTo",
-        "model": "user",
-        "foreignKey": "userId"
-      }
-    }
-  },
-  "ACL": {
-    "dataSource": "salix"
-  },
-  "RoleMapping": {
-    "dataSource": "salix"
-  },
-  "Role": {
-    "dataSource": "salix"
-  },
-  "Account": {
-    "dataSource": "salix"
-  },
   "Item": {
     "dataSource": "vn"
   },
@@ -53,8 +28,5 @@
   },
   "Expence": {
     "dataSource": "vn"
-  },
-  "Country": {
-    "dataSource": "salix"
   }
 }
diff --git a/services/loopback/common/locale/en.json b/services/loopback/common/locale/en.json
new file mode 100644
index 000000000..d824c1ad8
--- /dev/null
+++ b/services/loopback/common/locale/en.json
@@ -0,0 +1,7 @@
+{
+    "PHONE_INVALID_FORMAT": "The phone format is invalid",
+    "You are not allowed to change the credit": "You are not allowed to change the credit",
+    "Unable to mark the equivalence surcharge": "Unable to mark the equivalence surcharge",
+    "The default consignee can not be unchecked": "The default consignee can not be unchecked",
+	"Unable to default a disabled consignee": "Unable to default a disabled consignee"
+}
\ No newline at end of file
diff --git a/services/loopback/common/locale/es.json b/services/loopback/common/locale/es.json
new file mode 100644
index 000000000..88ac16272
--- /dev/null
+++ b/services/loopback/common/locale/es.json
@@ -0,0 +1,7 @@
+{
+	"PHONE_INVALID_FORMAT": "El formato del teléfono no es correcto",
+	"You are not allowed to change the credit": "No tienes privilegios para modificar el crédito",
+	"Unable to mark the equivalence surcharge": "No se puede marcar el recargo de equivalencia",
+	"The default consignee can not be unchecked": "No se puede desmarcar el consignatario predeterminado",
+	"Unable to default a disabled consignee": "No se puede poner predeterminado un consignatario desactivado"
+}
\ No newline at end of file
diff --git a/services/loopback/common/models/address.js b/services/loopback/common/models/address.js
index 0e81ce88a..993f52497 100644
--- a/services/loopback/common/models/address.js
+++ b/services/loopback/common/models/address.js
@@ -4,7 +4,7 @@ var isMultiple = require('../helpers').isMultiple;
 
 module.exports = function(Self) {
     Self.validate('isDefaultAddress', isActive,
-        {message: 'No se puede poner predeterminado un consignatario desactivado'}
+        {message: 'Unable to default a disabled consignee'}
     );
     function isActive(err) {
         if (!this.isActive && this.isDefaultAddress) err();
@@ -36,7 +36,7 @@ module.exports = function(Self) {
         let finalState = getFinalState(ctx);
 
         if (changes.isActive == false && finalState.isDefaultAddress)
-            throw new UserError('No se puede desmarcar el consignatario predeterminado');
+            throw new UserError('The default consignee can not be unchecked');
 
         if (changes.isDefaultAddress == true) {
             let filter = {
diff --git a/services/loopback/common/models/address.json b/services/loopback/common/models/address.json
index 52b95dd44..0e7b2a9d6 100644
--- a/services/loopback/common/models/address.json
+++ b/services/loopback/common/models/address.json
@@ -1,5 +1,6 @@
 {
   "name": "Address",
+  "description": "Client addresses",
   "base": "VnModel",
   "options": {
     "mysql": {
diff --git a/services/loopback/common/models/client.js b/services/loopback/common/models/client.js
index 04eaec7a1..2b21ccfa3 100644
--- a/services/loopback/common/models/client.js
+++ b/services/loopback/common/models/client.js
@@ -92,14 +92,14 @@ module.exports = function(Self) {
             let canMarkEqualizationTax = fiLetter != 'A' && fiLetter != 'B';
 
             if (finalState.isEqualizated && !canMarkEqualizationTax)
-                throw new UserError('No se puede marcar el recargo de equivalencia');
+                throw new UserError('Unable to mark the equivalence surcharge');
         }
 
         if (changes.credit !== undefined)
             try {
                 await validateCreditChange(ctx, finalState);
             } catch (e) {
-                throw new UserError('No tienes privilegios para modificar el crédito');
+                throw new UserError('You are not allowed to change the credit');
             }
     });
 
diff --git a/services/loopback/common/models/country.json b/services/loopback/common/models/country.json
index 304d28e16..c9523e8a3 100644
--- a/services/loopback/common/models/country.json
+++ b/services/loopback/common/models/country.json
@@ -1,5 +1,6 @@
 {
   "name": "Country",
+  "description": "Worldwide countries",
   "base": "VnModel",
   "options": {
     "mysql": {
diff --git a/services/loopback/common/models/credit-classification.json b/services/loopback/common/models/credit-classification.json
index d2b45f242..685ca00cf 100644
--- a/services/loopback/common/models/credit-classification.json
+++ b/services/loopback/common/models/credit-classification.json
@@ -1,6 +1,6 @@
 {
   "name": "CreditClassification",
-  "description": "Clientes clasificados.",
+  "description": "Clasified clients",
   "base": "VnModel",
   "options": {
     "mysql": {
diff --git a/services/loopback/common/models/province.json b/services/loopback/common/models/province.json
index a56b8a46f..49a971b65 100644
--- a/services/loopback/common/models/province.json
+++ b/services/loopback/common/models/province.json
@@ -1,5 +1,6 @@
 {
   "name": "Province",
+  "description": "Provinces of every country",
   "base": "VnModel",
   "options": {
     "mysql": {
diff --git a/services/loopback/common/models/vn-model.js b/services/loopback/common/models/vn-model.js
index 0e61d4737..60bc02724 100644
--- a/services/loopback/common/models/vn-model.js
+++ b/services/loopback/common/models/vn-model.js
@@ -125,7 +125,7 @@ module.exports = function(Self) {
 
     Self.disconnectFromService = function(dataSource) {
         this.app.dataSources[dataSource].connector.remotes.auth = {
-            bearer: new Buffer("").toString('base64'),
+            bearer: new Buffer('').toString('base64'),
             sendImmediately: true
         };
     };
@@ -229,5 +229,5 @@ function removeEmpty(o) {
 }
 
 function isEmpty(value) {
-    return value === undefined || value === "";
+    return value === undefined || value === '';
 }
diff --git a/services/loopback/common/models/warehouse.json b/services/loopback/common/models/warehouse.json
index 33ef06f52..7b6fef1cd 100644
--- a/services/loopback/common/models/warehouse.json
+++ b/services/loopback/common/models/warehouse.json
@@ -1,5 +1,6 @@
 {
   "name": "Warehouse",
+  "description": "Warehouses from where orders are sent",
   "base": "VnModel",
   "options": {
     "mysql": {
diff --git a/services/loopback/common/models/worker.json b/services/loopback/common/models/worker.json
index 6568d58b8..f8399be8d 100644
--- a/services/loopback/common/models/worker.json
+++ b/services/loopback/common/models/worker.json
@@ -1,5 +1,6 @@
 {
   "name": "Worker",
+  "description": "Company employees",
   "base": "VnModel",
   "options": {
     "mysql": {
diff --git a/services/loopback/server/middleware/error-handler.js b/services/loopback/server/middleware/error-handler.js
index f6360d87d..6565ca67a 100644
--- a/services/loopback/server/middleware/error-handler.js
+++ b/services/loopback/server/middleware/error-handler.js
@@ -1,10 +1,28 @@
+const UserError = require('../../common/helpers').UserError;
+
 module.exports = function() {
     return function(err, req, res, next) {
-        // MySQL user-defined exceptions are sent to the client
-        if (err.sqlState == '45000') {
-            err.statusCode = 400;
-            err.message = err.sqlMessage;
+        // Thrown user errors
+        if (err instanceof UserError) {
+            err.message = req.__(err.message);
+            return next(err);
         }
+
+        // Validation errors
+        if (err.statusCode == 422) {
+            try {
+                let code;
+                let messages = err.details.messages;
+                for (code in messages) break;
+                err.message = req.__(messages[code][0]);
+                return next(err);
+            } catch (e) {}
+        }
+
+        // MySQL user-defined exceptions
+        if (err.sqlState == '45000')
+            return next(new UserError(req.__(err.sqlMessage)));
+
         next(err);
     };
 };
diff --git a/services/loopback/server/model-config.json b/services/loopback/server/model-config.json
index 362f428f6..3a7aa2d22 100644
--- a/services/loopback/server/model-config.json
+++ b/services/loopback/server/model-config.json
@@ -1,18 +1,4 @@
 {
-  "_meta": {
-    "sources": [
-      "loopback/common/models",
-      "loopback/server/models",
-      "../common/models",
-      "./models"
-    ],
-    "mixins": [
-      "loopback/common/mixins",
-      "loopback/server/mixins",
-      "../common/mixins",
-      "./mixins"
-    ]
-  },
   "user": {
     "dataSource": "salix"
   },
@@ -37,5 +23,38 @@
   },
   "Account": {
     "dataSource": "account"
+  },
+  "Address": {
+    "dataSource": "vn"
+  },
+  "Agency": {
+    "dataSource": "vn"
+  },
+  "Client": {
+    "dataSource": "vn"
+  },
+  "ClientCreditLimit": {
+    "dataSource": "vn"
+  },
+  "ContactChannel": {
+    "dataSource": "vn"
+  },
+  "Country": {
+    "dataSource": "vn"
+  },
+  "CreditClassification": {
+    "dataSource": "vn"
+  },
+  "PayMethod": {
+    "dataSource": "vn"
+  },
+  "Province": {
+    "dataSource": "vn"
+  },
+  "Warehouse":{
+    "dataSource": "vn"
+  },
+  "Worker": {
+    "dataSource": "vn"
   }
 }
diff --git a/services/loopback/server/server.js b/services/loopback/server/server.js
index ab3726d46..6ebd49760 100644
--- a/services/loopback/server/server.js
+++ b/services/loopback/server/server.js
@@ -1,9 +1,9 @@
 
-var loopback = require('loopback');
-var boot = require('loopback-boot');
-var path = require('path');
-var fs = require('fs');
-var i18n = require('i18n');
+let loopback = require('loopback');
+let boot = require('loopback-boot');
+let path = require('path');
+let fs = require('fs');
+let i18n = require('i18n');
 
 module.exports = {
     loopback: loopback,
@@ -13,18 +13,15 @@ module.exports = {
 function vnBoot(app, rootDir, rootModule) {
     // Internationalization
 
-    let i18nDir = rootDir + '/i18n';
+    let localeDir = `${__dirname}/../common/locale`;
 
-    if (fs.existsSync(i18nDir)) {
+    if (fs.existsSync(localeDir)) {
         i18n.configure({
-            directory: i18nDir,
+            directory: localeDir,
             defaultLocale: 'es'
         });
 
-        app.get('/prueba', function(req, res) {
-            i18n.setLocale(req.get('Accept-Language').substring(0, 2));
-            res.send(i18n.__('Hello'));
-        });
+        app.use(i18n.init);
     }
 
     // View
@@ -45,40 +42,52 @@ function vnBoot(app, rootDir, rootModule) {
     app.start = function() {
         return app.listen(function() {
             app.emit('started');
-            var baseUrl = app.get('url').replace(/\/$/, '');
+            let baseUrl = app.get('url').replace(/\/$/, '');
             console.log(`Web server ${appName} listening at: %s`, baseUrl);
         });
     };
 
     let config = require('./config.json');
 
-    for (var key in config) {
+    for (let key in config) {
         app.set(key, config[key]);
     }
 
-    var bootOptions = {
+    let modelConfigFiles = [
+        `${__dirname}/model-config.json`,
+        `${rootDir}/model-config.json`
+    ];
+
+    let modelConfig = {};
+
+    for (file of modelConfigFiles)
+        if (fs.existsSync(file))
+            Object.assign(modelConfig, require(file));
+
+    let bootOptions = {
         appRootDir: __dirname,
         appConfigRootDir: rootDir,
         modelsRootDir: rootDir,
+        models: modelConfig,
         modelSources: [
-            'loopback/common/models',
-            'loopback/server/models',
-            path.join(__dirname, '../common/models'),
-            path.join(__dirname, 'models'),
-            rootDir + '/../common/models',
-            rootDir + '/models'
+            `loopback/common/models`,
+            `loopback/server/models`,
+            `${__dirname}/../common/models`,
+            `${__dirname}/models`,
+            `${rootDir}/../common/models`,
+            `${rootDir}/models`
         ],
         mixinDirs: [
-            'loopback/common/mixins',
-            'loopback/server/mixins',
-            path.join(__dirname, '../common/mixins'),
-            path.join(__dirname, 'mixins'),
-            rootDir + '/../common/mixins',
-            rootDir + '/mixins'
+            `loopback/common/mixins`,
+            `loopback/server/mixins`,
+            `${__dirname}/../common/mixins`,
+            `${__dirname}/mixins`,
+            `${rootDir}/../common/mixins`,
+            `${rootDir}/mixins`
         ],
         bootDirs: [
-            path.join(__dirname, 'boot'),
-            rootDir + '/boot'
+            `${__dirname}/boot`,
+            `${rootDir}/boot`
         ]
     };
 
diff --git a/services/production/server/model-config.json b/services/production/server/model-config.json
index e83385c74..f06d6f57d 100644
--- a/services/production/server/model-config.json
+++ b/services/production/server/model-config.json
@@ -1,50 +1,4 @@
 {
-  "user": {
-    "dataSource": "salix"
-  },
-  "AccessToken": {
-    "dataSource": "salix",
-    "relations": {
-      "user": {
-        "type": "belongsTo",
-        "model": "user",
-        "foreignKey": "userId"
-      }
-    }
-  },
-  "ACL": {
-    "dataSource": "salix"
-  },
-  "RoleMapping": {
-    "dataSource": "salix"
-  },
-  "Role": {
-    "dataSource": "salix"
-  },
-  "Account": {
-    "dataSource": "account"
-  },
-  "Ticket": {
-    "dataSource": "vn"
-  },
-  "State":{
-    "dataSource": "vn"
-  },
-  "TicketState":{
-    "dataSource": "vn"
-  },
-  "Warehouse":{
-    "dataSource": "vn"
-  },
-  "Client":{
-    "dataSource": "vn"
-  },
-  "Province":{
-    "dataSource": "vn"
-  },
-  "Agency": {
-    "dataSource": "vn"
-  },
   "FakeProduction": {
     "dataSource": "vn"
   },
@@ -57,10 +11,16 @@
   "Route": {
     "dataSource": "vn"
   },
-  "TicketTracking": {
+  "State":{
     "dataSource": "vn"
   },
-  "Worker": {
+  "Ticket": {
+    "dataSource": "vn"
+  },
+  "TicketState":{
+    "dataSource": "vn"
+  },
+  "TicketTracking": {
     "dataSource": "vn"
   }
 }
diff --git a/services/route/server/model-config.json b/services/route/server/model-config.json
index eba03209d..5b7a0dc34 100644
--- a/services/route/server/model-config.json
+++ b/services/route/server/model-config.json
@@ -1,39 +1,11 @@
 {
-  "user": {
-    "dataSource": "salix"
-  },
-  "AccessToken": {
-    "dataSource": "salix",
-    "relations": {
-      "user": {
-        "type": "belongsTo",
-        "model": "user",
-        "foreignKey": "userId"
-      }
-    }
-  },
-  "ACL": {
-    "dataSource": "salix"
-  },
-  "RoleMapping": {
-    "dataSource": "salix"
-  },
-  "Role": {
-    "dataSource": "salix"
-  },
-  "Account": {
-    "dataSource": "account"
-  },
   "Delivery": {
     "dataSource": "vn"
   },
-  "Zone": {
-    "dataSource": "vn"
-  },
-  "Agency": {
-    "dataSource": "vn"
-  },
   "Vehicle": {
     "dataSource": "vn"
+  },
+  "Zone": {
+    "dataSource": "vn"
   }
 }
diff --git a/services/salix/server/boot/routes.js b/services/salix/server/boot/routes.js
index 713f82e2a..c7e5d09b3 100644
--- a/services/salix/server/boot/routes.js
+++ b/services/salix/server/boot/routes.js
@@ -58,7 +58,7 @@ module.exports = function(app) {
     function validateToken(tokenId, cb) {
         models.AccessToken.findById(tokenId, function(err, token) {
             if (token) {
-                token.validate(function (err, isValid) {
+                token.validate(function(err, isValid) {
                     cb(isValid === true, token);
                 });
             } else
diff --git a/services/salix/server/model-config.json b/services/salix/server/model-config.json
deleted file mode 100644
index 09562e916..000000000
--- a/services/salix/server/model-config.json
+++ /dev/null
@@ -1,27 +0,0 @@
-{
-  "user": {
-    "dataSource": "salix"
-  },
-  "AccessToken": {
-    "dataSource": "salix",
-    "relations": {
-      "user": {
-        "type": "belongsTo",
-        "model": "user",
-        "foreignKey": "userId"
-      }
-    }
-  },
-  "ACL": {
-    "dataSource": "salix"
-  },
-  "RoleMapping": {
-    "dataSource": "salix"
-  },
-  "Role": {
-    "dataSource": "salix"
-  },
-  "Account": {
-    "dataSource": "account"
-  }
-}