Hi,
today I have finished goals within the GSoC project.
Finally, the modules are available in addons [1] and documentation and manual is on wiki pages [2].
Thank you for giving me chance to take part in this project.
Best,
Matej
[1] http://trac.osgeo.org/grass/browser/grass-addons/grass7/gui/wxpython/wx.metadata
[2] http://grasswiki.osgeo.org/wiki/ISO/INSPIRE_Metadata_Support