rhbz1157359 - remove extension check when dealing with unqualified sourc...

We were checking argument that is passed to UnqualifiedSrcDocName to not have extension. But there is really no way to tell. Files may contain "." in it and will be treated as if it's extension. If calling this method inappropriately(unlikely), it will produce bad translation files. But that's not the end of the world...

To fix https://bugzilla.redhat.com/show_bug.cgi?id=1157359