feat(core): Add URL encryption for GDPR compliancy

UI/MainUI/SOGoRootPage.m

@@ -343,6 +343,8 @@ static const NSString *kJwtKey = @"jwt";
                 forKey: @"expire"];
         [json setObject: [NSNumber numberWithInt: grace]
                 forKey: @"grace"];
+        [json setObject: [SOGoUser getEncryptedUsernameIfNeeded: username withContext: context]
+                forKey: @"username"];
 
         response = [self responseWithStatus: 200
                       andJSONRepresentation: json];