add error icon, statustip -> dialog

icons/icons.yaml

@@ -1,15 +1,16 @@
 color: '#B89230' #Hex code of the color
 icons:
-  newentry: library_add.svg
+  addBook: add_book.svg
+  add_user: add_user.svg
+  backup: db_backup.svg
+  borrow: book.svg
+  duplicate: duplicate.svg
+  error: error.svg
+  loan_extend: calendar_event.svg
   main: library.svg  
-  warning: warning.svg
+  multiuser: multiple_user.svg
+  newentry: library_add.svg
+  report: report.svg
   settings: settings.svg
   user: user.svg
-  multiuser: multiple_user.svg
-  add_user: add_user.svg
-  borrow: book.svg
-  backup: db_backup.svg
-  addBook: add_book.svg
-  report: report.svg
-  duplicate: duplicate.svg
-  loan_extend: calendar_event.svg
+  warning: warning.svg