[eluser]xwero[/eluser]
The POST key for those inputs is name. CI has not trouble to store it in a database but you can have problems with the validation and input library.
The validation library can't handle arrays yet, the new version in SVN can.
The input->post method will see the adding of the parameter 'name[gr]' as the name of the key so it will not recognise it's a part of an array.
What you could do is to suffix the name with the language abbreviation. So you get name_gr, name_en, name_it but that is a bit less convenient to process.