This is not uncommon. If by the beginning of December it is still not available in Hungarian: download and import another language (English e.g.) then: go to Settings / LMM Meeting / Schedule tab. Select the week you want to modify, then for each item double click the Theme and source 'cells' and copy paste from jw.org or wol.jw.org the correct info.
It is easier, faster and less tricky to change the schedule in an existing language, than to build your own from scratch.