Update index.php

Updated some german language parts
Merge pull request #160 from ciscllc/master

Update index.php
Relax default rules, let's make $dns_strict_tld_check = false, partial solution for #161
Merge branch 'master' of https://github.com/poweradmin/poweradmin
Initial fix for #76 - don't allow to create zones for which similar zones exist.