Fixed #13521 - make modal “select files” button wider

[snipe]

While I don't think this visually looks as nice as the previous incarnation, a user brought up that for languages that have very long strings as the phrase for "select file" or "select files", the button text runs off the side of the button. This change makes the button the full width of the modal, and puts the selected files underneath.

Before

After

Fixes #13521

[what-the-diff]

PR Summary

• User Interface Adjustment in upload-file.blade.php
  The user interface has been optimized to provide a more balanced and aesthetic design. This was achieved by modifying the width of certain sections to utilize the full available column width.

• Enhancement of Label Element
  The label element has been updated to not only serve as a descriptive label but also as a clickable control for better user interaction.

• Button Text Update
  The Upload Button has been updated to imply the ability to select multiple files at once, providing the users with a clearer interface and accurate instructions.

These changes serve to improve the user experience by making the interface more intuitive and user-friendly.