Minor refactor and initial implementation of online translation service

src/main/java/es/yonatan/tfg/Main.java

@@ -40,7 +40,7 @@ public class Main {
 
 		System.out.println(System.currentTimeMillis() - time);
 
-		new DeeplTranslator<UnitGroup>("f6542fe3-8e30-5cd2-064e-5eb18c7dbbf3:fx").translate(groups, null, "en-US");
+		new DeeplTranslator<UnitGroup>("secret").translate(groups, null, "en-US");
 
 		// basic GUI to render the bounding boxes resulting of the OCR recognition as well as testing the word merge algorithm