Full split of lang.rs

src/data_provider/words.rs

@@ -1,6 +1,6 @@
-use crate::lang::{WordData, WordGroup};
 use rusqlite::{Connection, params};
 use std::collections::HashMap;
+use crate::data::entities::{WordData, WordGroup};
 
 pub fn add_word(word: &mut WordData, connection: &Connection) {
     let index : u32 = connection