Refactor UI elements for consistency and clarity

- Updated action buttons across multiple files to use icons (e.g., "Save" to "💾+", "Delete" to "X").
- Replaced "Cancel" button text with a left arrow (←) for a more intuitive navigation experience.
- Removed unnecessary action columns from tables to streamline the interface.
- Enhanced table rows to be clickable for better user interaction, redirecting to relevant management pages.
- Adjusted font sizes and styles in CSS for improved readability and aesthetics.
- Standardized back button functionality to use a left arrow across various pages.

communication_send.php

@@ -37,7 +37,7 @@ $view ='
 <form action="" method="post">
     <div class="content-title responsive-flex-wrap responsive-pad-bot-3">
         <h2 class="responsive-width-100">'.$communication_send_firmware_h2.'</h2>
-        <a href="index.php?page=communications" class="btn alt mar-right-2">'.$button_cancel.'</a>
+        <a href="index.php?page=communications" class="btn alt mar-right-2">←</a>
 ';
 
 if ($update_allowed === 1){