Yes i know.
for every language used you have to create specific language files for example files containing all itemnames etc. , texturefiles for worldmap and townmaps and systemvoice. those language files end with the extension "-[language]" like -e for english, -ru for russian, -kr for korean....etc.
you will also notice this when opening the localization.ini. u will see that every extension e.g. -e has its linkings to their language files (texture files too...l2font-e.utx).
the default language is set in (im not at my computer right now) core.int or engine.int (not sure now).
the problem is....the dropdown menue (ingame) for language selection wont show u other languages than english. so u cant change it. there must be another file where u can specify selectable languages for example english and russian only....or in my case i want to have english and german only.(i have full translated files / client version H5)
so im stuck at this point. :(