Oh malaka you could have asked me this directly
server.jar\l2\gameserver\utils\Language.java -> Enum that defines the languages available
server.jar\l2\gameserver\data\htm\HtmCache.java -> HTML Cache that holds all the info about the HTML to show for the specified language
server.jar\l2\gameserver\data\StringHolder.java -> StringHolder for the strings we show in the system messages and etc
Other less important files:
View attachment 6571