Modify the sending time from 250ms to 1500ms

[sayfuz]

Changes made:

Message sending time was adjusted from 250 ms to 1500 ms. This change was made to prevent WhatsApp from classifying messages as spam, which prevented the generation of notifications. After extensive testing, it was determined that an interval of 1500 ms was optimal to ensure effective triggering of sound notifications.

In addition:

Translated the tutorial into English with the goal of broadening its accessibility to a global audience.