add migration script to V4.5.0

version_upgrades/4.5.0/4.5.0.php

@@ -0,0 +1,14 @@
+<?php
+require_once '../mysql_connect.php';
+print 'Begin update v4.5.0...' . PHP_EOL;
+
+// Update Languages
+print '[1/1] Updating languages table...' . PHP_EOL;
+if ($mysql->query("SELECT * FROM language WHERE code='pl' ")->num_rows == 0) {
+	$mysql->query("INSERT into language VALUES(NULL, 'pl', '0', '0')");
+} else {
+	print 'Polish language already exists' . PHP_EOL;
+}
+
+print 'Update Completed!' . PHP_EOL;
+