Adds a language item. Language placeholders preceded with "#" are replaced with full text in Garry's Mod once registered with this function.
Small excerpt from a STOOL named cooltool. It has been registered as cooltool.
language.Add("Tool_cooltool_name", "The really cool tool") language.Add("Tool_cooltool_desc", "Do some random cool stuff.") language.Add("Tool_cooltool_0", "Left-click: Cool Stuff. Right-click: Nothing.") language.Add("Undone_cooltool", "Cool stuff has been undone.")