Add .phtml extension to parsers.

It is used by the Zend Framework for PHP files.
Add --add-comments=translators: xgettext argument.

In addition to TRANSLATORS, use WordPress' translators: by default as well.
Disable logs timestamping.
Fix failures to work with the TM in non-ASCII paths.

LucenePlusPlus has broken code for handling with Unicode paths - it
converts them with UTF-8 even on Windows, where it's all but guaranteed
to break.  Fixing it is not entirely trivial, so work around this in the
meantime by using short paths on Windows.

See #560.
Update Japanese translation file for 1.6
Update German translation