Index: kernel/utility/formatters/multilang_formatter.php
===================================================================
--- kernel/utility/formatters/multilang_formatter.php	(revision 13354)
+++ kernel/utility/formatters/multilang_formatter.php	(working copy)
@@ -103,13 +103,11 @@
 			unset($fields[$field_name]['required'], $object->Fields[$field_name]['required']);
 
 			// prevents real field with formatter set to be saved in db
+			$virtual_fields[$field_name] = $object->Fields[$field_name];
 			$object->VirtualFields[$field_name] = $object->Fields[$field_name];
-
-			$this->Application->setUnitOption($object->Prefix, 'Fields', $fields);
 		}
-
-		// substitude virtual field
-		if (array_key_exists($field_name, $virtual_fields)) {
+		elseif (array_key_exists($field_name, $virtual_fields)) {
+			// substitude virtual field
 			$calculated_fields = $this->Application->getUnitOption($object->Prefix, 'CalculatedFields');
 			$calculated_field_special = array_key_exists($object->Special, $calculated_fields) ? $object->Special : (array_key_exists('', $calculated_fields) ? '' : false);
 
@@ -149,6 +147,7 @@
 				}
 
 				// manually copy virtual field back to fields (see kDBBase::setVirtualFields about that)
+				$fields[$translated_field] = $tmp_field_options;
 				$object->Fields[$translated_field] = $tmp_field_options;
 			}
 
@@ -164,8 +163,6 @@
 
 			// makes original field non-required
 			unset($virtual_fields[$field_name]['required'], $object->VirtualFields[$field_name]['required']);
-
-			$this->Application->setUnitOption($object->Prefix, 'VirtualFields', $virtual_fields);
 		}
 
 		//substitude grid fields
@@ -205,9 +202,9 @@
 		$this->Application->setUnitOption($object->Prefix, 'ListSortings', $sortings);
 
 		//TODO: substitude possible language-fields sortings after changing language
-
 		$fields[$field_name]['options_processed'] = $field_options['options_processed'] = true;
 		$this->Application->setUnitOption($object->Prefix, 'Fields', $fields);
+		$this->Application->setUnitOption($object->Prefix, 'VirtualFields', $virtual_fields);
 	}
 
 	/*function UpdateSubFields($field, $value, &$options, &$object)
Index: units/sections/site_config_eh.php
===================================================================
--- units/sections/site_config_eh.php	(revision 13354)
+++ units/sections/site_config_eh.php	(working copy)
@@ -40,6 +40,11 @@
 			$prefix_file = substr($prefix_file, 0, $cut_pos) . '_' . $event->MasterEvent->Prefix . '.php';
 
 			if (file_exists(SYSTEM_PRESET_PATH . DIRECTORY_SEPARATOR . $prefix_file)) {
+				if ( $this->Application->getUnitOption($event->MasterEvent->Prefix, 'SiteConfigProcessed') ) {
+					// don't apply same site config twice during installation
+					return ;
+				}
+
 				require SYSTEM_PRESET_PATH . DIRECTORY_SEPARATOR . $prefix_file;
 			}
 			else {
@@ -61,5 +66,6 @@
 
 			// apply changes
 			$this->_helper->processConfigChanges($event->MasterEvent->Prefix, $changes);
+			$this->Application->setUnitOption($event->MasterEvent->Prefix, 'SiteConfigProcessed', true);
 		}
 	}
\ No newline at end of file