Rename DictionaryTest to DictionaryQuiz

src/dictionary.rs

@@ -1,6 +1,6 @@
 use crate::data_provider::words::{delete_group, delete_word, update_group, update_word};
 use crate::dictionary::DictionaryMessage::*;
-use crate::dictionary_test::DictionaryQuizState;
+use crate::dictionary_quiz::DictionaryQuizState;
 use crate::import::ImportState;
 use crate::lang::{WordData, WordGroup};
 use crate::navigation::Page::{Import, Word};