Hey Vera,
Well, the language file for Matukio is the following directories:
administrator/components/en-GB/en-GB.com_matukio.ini
administrator/components/en-GB/en-GB.com_matukio.sys.ini
/components/en-GB/en-GB.com_matukio.ini
etc.
We use transifex for our translations and I'm sure that you'll like it as well!
opentranslators.transifex.net/projects/p/compojoom-matukio/
Basically - you can translate it directly on the transifex site and there is no need to send us mails, or to attach files in the forum. Once you are ready we just pull everything in the package and it lands in the next release.
The translations on transifex are handled by opentranslators.org - this is a group of volunteers that are translating joomla extensions. Your first step would be to take part of their Hungarian translation team.
Actually you can find instructions here:
compojoom.com/about/blog/entry/translate...with-opentranslators
Thank you for taking your time to help us with this!
Cheers,
Daniel