Added folder guess

app/src/main/java/eu/faircode/email/EntityFolder.java

@@ -173,6 +173,7 @@ public class EntityFolder extends EntityOrder implements Serializable {
         // Contains:
         put("all", new TypeScore(EntityFolder.ARCHIVE, 100));
         put("archive", new TypeScore(EntityFolder.ARCHIVE, 100));
+        put("archief", new TypeScore(EntityFolder.ARCHIVE, 100)); // Dutch
 
         put("draft", new TypeScore(EntityFolder.DRAFTS, 100));
         put("concept", new TypeScore(EntityFolder.DRAFTS, 100));