Fixes translation strong for "group not found" error

[snipe]

This corrects the language string that displays when a group is not found, and also switches to use a user icon in the header to make it more consistent with the rest of the Snipe-IT UI.

Before:

After:

[what-the-diff]

PR Summary

• 🚀 Improved error message for missing groups
  The error message now includes the ID of the missing group for easier identification.
• 🔍 New icon for user count
  A new icon displays the number of users associated with each group, making it visually more appealing.
• 🌐 Enhanced translation function
  An extra parameter has been added to trans() function calls for better handling of translation strings and associated variables.