Enhance product links and translations; update styles and add registration modal

- Updated product links in rma.php and rma_manage.php to include icons for better UX.
- Improved German, Spanish, Dutch, Polish, Portuguese, and US translations with new phrases for software licenses and user information prompts.
- Refactored CSS to remove redundant styles and added new styles for a registration modal, enhancing the overall UI.
- Introduced JavaScript variables for user information prompts in softwaretool.php for better localization support.

login.php

@@ -140,7 +140,7 @@ echo'
     <div class="login-container">
         <div class="login-form">
             <div class="logo"></div>
-            <a href="#" class="register-link"></a>';
+            <a href="register.php" class="register-link">'.strtolower($account_create ?? 'create account').'</a>';
             
             if (maintenance_mode)
             {