diff --git a/errors/errors.go b/errors/errors.go
index e40b3c23..a99a3ab5 100644
--- a/errors/errors.go
+++ b/errors/errors.go
@@ -6,22 +6,27 @@ package errors
 
 import (
 	"fmt"
+
 	"github.com/miniflux/miniflux2/locale"
 )
 
+// LocalizedError represents an error than could be translated to another language.
 type LocalizedError struct {
 	message string
 	args    []interface{}
 }
 
+// Error returns untranslated error message.
 func (l LocalizedError) Error() string {
 	return fmt.Sprintf(l.message, l.args...)
 }
 
+// Localize returns the translated error message.
 func (l LocalizedError) Localize(translation *locale.Language) string {
 	return translation.Get(l.message, l.args...)
 }
 
+// NewLocalizedError returns a new LocalizedError.
 func NewLocalizedError(message string, args ...interface{}) LocalizedError {
 	return LocalizedError{message: message, args: args}
 }
diff --git a/locale/translations.go b/locale/translations.go
index 7b9bf15f..abf35601 100644
--- a/locale/translations.go
+++ b/locale/translations.go
@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2017-11-20 13:44:53.735395751 -0800 PST m=+0.047479249
+// 2017-11-20 14:18:33.283078515 -0800 PST m=+0.039164593
 
 package locale
 
@@ -125,12 +125,13 @@ var Translations = map[string]string{
     "Never": "Jamais",
     "Unable to execute request: %v": "Impossible d'exécuter cette requête: %v",
     "Last Parsing Error": "Dernière erreur d'analyse",
-    "There is a problem with this feed": "Il y a un problème avec cet abonnement"
+    "There is a problem with this feed": "Il y a un problème avec cet abonnement",
+    "Unable to parse OPML file: %v": "Impossible de lire le fichier OPML : %v"
 }
 `,
 }
 
 var TranslationsChecksums = map[string]string{
 	"en_US": "6fe95384260941e8a5a3c695a655a932e0a8a6a572c1e45cb2b1ae8baa01b897",
-	"fr_FR": "1f75e5a4b581755f7f84687126bc5b96aaf0109a2f83a72a8770c2ad3ddb7ba3",
+	"fr_FR": "8b38f8e33f70c463560b49e7f408509304e4d8f61ae78ca26e33bbba28a9ec76",
 }
diff --git a/locale/translations/fr_FR.json b/locale/translations/fr_FR.json
index 7699bb70..863596cc 100644
--- a/locale/translations/fr_FR.json
+++ b/locale/translations/fr_FR.json
@@ -109,5 +109,6 @@
     "Never": "Jamais",
     "Unable to execute request: %v": "Impossible d'exécuter cette requête: %v",
     "Last Parsing Error": "Dernière erreur d'analyse",
-    "There is a problem with this feed": "Il y a un problème avec cet abonnement"
+    "There is a problem with this feed": "Il y a un problème avec cet abonnement",
+    "Unable to parse OPML file: %v": "Impossible de lire le fichier OPML : %v"
 }
diff --git a/reader/opml/parser.go b/reader/opml/parser.go
index 5d8babd4..22706413 100644
--- a/reader/opml/parser.go
+++ b/reader/opml/parser.go
@@ -6,12 +6,13 @@ package opml
 
 import (
 	"encoding/xml"
-	"fmt"
 	"io"
 
+	"github.com/miniflux/miniflux2/errors"
 	"golang.org/x/net/html/charset"
 )
 
+// Parse reads an OPML file and returns a SubcriptionList.
 func Parse(data io.Reader) (SubcriptionList, error) {
 	opml := new(Opml)
 	decoder := xml.NewDecoder(data)
@@ -19,7 +20,7 @@ func Parse(data io.Reader) (SubcriptionList, error) {
 
 	err := decoder.Decode(opml)
 	if err != nil {
-		return nil, fmt.Errorf("Unable to parse OPML file: %v\n", err)
+		return nil, errors.NewLocalizedError("Unable to parse OPML file: %v", err)
 	}
 
 	return opml.Transform(), nil
diff --git a/reader/opml/parser_test.go b/reader/opml/parser_test.go
index 02543dfc..95a832b3 100644
--- a/reader/opml/parser_test.go
+++ b/reader/opml/parser_test.go
@@ -133,6 +133,6 @@ func TestParseInvalidXML(t *testing.T) {
 
 	_, err := Parse(bytes.NewBufferString(data))
 	if err == nil {
-		t.Error(err)
+		t.Error("Parse should generate an error")
 	}
 }
diff --git a/reader/opml/serializer.go b/reader/opml/serializer.go
index 20c7046a..3ca859af 100644
--- a/reader/opml/serializer.go
+++ b/reader/opml/serializer.go
@@ -11,6 +11,7 @@ import (
 	"log"
 )
 
+// Serialize returns a SubcriptionList in OPML format.
 func Serialize(subscriptions SubcriptionList) string {
 	var b bytes.Buffer
 	writer := bufio.NewWriter(&b)
@@ -34,7 +35,7 @@ func Serialize(subscriptions SubcriptionList) string {
 	}
 
 	encoder := xml.NewEncoder(writer)
-	encoder.Indent("  ", "    ")
+	encoder.Indent("    ", "    ")
 	if err := encoder.Encode(opml); err != nil {
 		log.Println(err)
 		return ""
@@ -47,10 +48,6 @@ func groupSubscriptionsByFeed(subscriptions SubcriptionList) map[string]Subcript
 	groups := make(map[string]SubcriptionList)
 
 	for _, subscription := range subscriptions {
-		// if subs, ok := groups[subscription.CategoryName]; !ok {
-		// groups[subscription.CategoryName] = SubcriptionList{}
-		// }
-
 		groups[subscription.CategoryName] = append(groups[subscription.CategoryName], subscription)
 	}
 
diff --git a/reader/opml/serializer_test.go b/reader/opml/serializer_test.go
index b1ef2a63..dd431d9d 100644
--- a/reader/opml/serializer_test.go
+++ b/reader/opml/serializer_test.go
@@ -4,8 +4,11 @@
 
 package opml
 
-import "testing"
-import "bytes"
+import (
+	"bytes"
+	"fmt"
+	"testing"
+)
 
 func TestSerialize(t *testing.T) {
 	var subscriptions SubcriptionList
@@ -14,6 +17,7 @@ func TestSerialize(t *testing.T) {
 	subscriptions = append(subscriptions, &Subcription{Title: "Feed 3", FeedURL: "http://example.org/feed/3", SiteURL: "http://example.org/3", CategoryName: "Category 2"})
 
 	output := Serialize(subscriptions)
+	fmt.Println(output)
 	feeds, err := Parse(bytes.NewBufferString(output))
 	if err != nil {
 		t.Error(err)
@@ -23,9 +27,16 @@ func TestSerialize(t *testing.T) {
 		t.Errorf("Wrong number of subscriptions: %d instead of %d", len(feeds), 3)
 	}
 
-	for i := 0; i < len(feeds); i++ {
-		if !feeds[i].Equals(subscriptions[i]) {
-			t.Errorf(`Subscription are different: "%v" vs "%v"`, subscriptions[i], feeds[i])
+	found := false
+	for _, feed := range feeds {
+		if feed.Title == "Feed 1" && feed.CategoryName == "Category 1" &&
+			feed.FeedURL == "http://example.org/feed/1" && feed.SiteURL == "http://example.org/1" {
+			found = true
+			break
 		}
 	}
+
+	if !found {
+		t.Error("Serialized feed is incorrect")
+	}
 }
diff --git a/server/static/bin.go b/server/static/bin.go
index 32ac5b65..e9cba0f1 100644
--- a/server/static/bin.go
+++ b/server/static/bin.go
@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2017-11-20 13:44:53.696612572 -0800 PST m=+0.008696070
+// 2017-11-20 14:18:33.249018092 -0800 PST m=+0.005104170
 
 package static
 
diff --git a/server/static/css.go b/server/static/css.go
index b862d6ae..105de9a8 100644
--- a/server/static/css.go
+++ b/server/static/css.go
@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2017-11-20 13:44:53.70263347 -0800 PST m=+0.014716968
+// 2017-11-20 14:18:33.25118969 -0800 PST m=+0.007275768
 
 package static
 
diff --git a/server/static/js.go b/server/static/js.go
index cf47d473..ceea2893 100644
--- a/server/static/js.go
+++ b/server/static/js.go
@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2017-11-20 13:44:53.707892515 -0800 PST m=+0.019976013
+// 2017-11-20 14:18:33.255571671 -0800 PST m=+0.011657749
 
 package static
 
diff --git a/server/template/common.go b/server/template/common.go
index 4e41d023..80bdd394 100644
--- a/server/template/common.go
+++ b/server/template/common.go
@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2017-11-20 13:44:53.731951822 -0800 PST m=+0.044035320
+// 2017-11-20 14:18:33.28176883 -0800 PST m=+0.037854908
 
 package template
 
diff --git a/server/template/template.go b/server/template/template.go
index 086cdc5c..7e2bf217 100644
--- a/server/template/template.go
+++ b/server/template/template.go
@@ -6,11 +6,6 @@ package template
 
 import (
 	"bytes"
-	"github.com/miniflux/miniflux2/errors"
-	"github.com/miniflux/miniflux2/locale"
-	"github.com/miniflux/miniflux2/server/route"
-	"github.com/miniflux/miniflux2/server/template/helper"
-	"github.com/miniflux/miniflux2/server/ui/filter"
 	"html/template"
 	"io"
 	"log"
@@ -18,6 +13,12 @@ import (
 	"strings"
 	"time"
 
+	"github.com/miniflux/miniflux2/errors"
+	"github.com/miniflux/miniflux2/locale"
+	"github.com/miniflux/miniflux2/server/route"
+	"github.com/miniflux/miniflux2/server/template/helper"
+	"github.com/miniflux/miniflux2/server/ui/filter"
+
 	"github.com/gorilla/mux"
 )
 
@@ -61,11 +62,13 @@ func (t *TemplateEngine) ParseAll() {
 		},
 		"t": func(key interface{}, args ...interface{}) string {
 			switch key.(type) {
-			case string, error:
+			case string:
 				return t.currentLocale.Get(key.(string), args...)
 			case errors.LocalizedError:
 				err := key.(errors.LocalizedError)
 				return err.Localize(t.currentLocale)
+			case error:
+				return key.(error).Error()
 			default:
 				return ""
 			}
diff --git a/server/template/views.go b/server/template/views.go
index f5ce314a..c7376f03 100644
--- a/server/template/views.go
+++ b/server/template/views.go
@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2017-11-20 13:44:53.712375345 -0800 PST m=+0.024458843
+// 2017-11-20 14:18:33.257809595 -0800 PST m=+0.013895673
 
 package template
 
diff --git a/server/ui/controller/opml.go b/server/ui/controller/opml.go
index 45d34f8e..9d4d2afc 100644
--- a/server/ui/controller/opml.go
+++ b/server/ui/controller/opml.go
@@ -5,8 +5,9 @@
 package controller
 
 import (
-	"github.com/miniflux/miniflux2/server/core"
 	"log"
+
+	"github.com/miniflux/miniflux2/server/core"
 )
 
 func (c *Controller) Export(ctx *core.Context, request *core.Request, response *core.Response) {
@@ -52,7 +53,7 @@ func (c *Controller) UploadOPML(ctx *core.Context, request *core.Request, respon
 		}
 
 		response.Html().Render("import", args.Merge(tplParams{
-			"errorMessage": impErr.Error(),
+			"errorMessage": impErr,
 			"menu":         "feeds",
 		}))
 
diff --git a/sql/sql.go b/sql/sql.go
index f4bb1233..95a0e2e0 100644
--- a/sql/sql.go
+++ b/sql/sql.go
@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2017-11-20 13:44:53.690484632 -0800 PST m=+0.002568130
+// 2017-11-20 14:18:33.247054842 -0800 PST m=+0.003140920
 
 package sql