If we assume you have a dictionary file called "dictionary.txt" in amxmodx/data/lang folder, and you have this line in it.
First, you'll have to register the dictionary in plugin_init:
Code:
register_dictionary("dictionary.txt")
Then, use it in a way like this:
Code:
client_print(id, print_chat, "%L", id, "TEST")
You gotta have the "id" there because you want to use the id's language.
This will print out "Test" in chat.