add version and translate all pages

backend/models/clients.go

@@ -8,19 +8,19 @@ type Client interface {
 	GetClientVersion() int
 }
 
-func NewClient(clientVersion int) (error, Client) {
+func NewClient(clientVersion int) (Client, error) {
 
 	isCompatible := ServerClientIsCompatibleWithClient(clientVersion)
 
 	if !isCompatible {
-		return fmt.Errorf("You client version %d is not compatible with the server verison %d", clientVersion, SERVER_VERSION), nil
+		return nil, fmt.Errorf("client version %d is not compatible with the server version %d", clientVersion, SERVER_VERSION)
 	}
 
 	client := ClientVerisonOne{
 		Version: clientVersion,
 	}
 
-	return nil, &client
+	return &client, nil
 
 }
 

backend/models/documents.go

@@ -1,7 +1,7 @@
 package models
 
 import (
-	"fmt"
+	"errors"
 )
 
 type Document struct {
@@ -37,19 +37,19 @@ func IsDirectory(documentType int) bool {
 	return DIRECTORY == documentType
 }
 
-func NewDocument(documentName string, documentType int, documentVersion int) (error, *Document) {
+func NewDocument(documentName string, documentType int, documentVersion int) (*Document, error) {
 
 	documentTypeIsValid := IsDocumentTypeValid(documentType)
 
 	if !documentTypeIsValid {
-		return fmt.Errorf(ERROR_DOCUMENT_TYPE), nil
+		return nil, errors.New(ERROR_DOCUMENT_TYPE)
 	}
 
-	return nil, &Document{
+	return &Document{
 		Name:    &documentName,
 		Type:    documentType,
 		Version: documentVersion,
-	}
+	}, nil
 
 }
 

backend/models/users.go

@@ -4,8 +4,8 @@ type User struct {
 	Username string
 }
 
-func NewUser(username string) (error, *User) {
-	return nil, &User{
+func NewUser(username string) (*User, error) {
+	return &User{
 		Username: username,
-	}
+	}, nil
 }