Fix (UI): Conditional Rendering of Placeholder Text Based on User Role

[Darshan808]

Fixes #4937

This PR fixes an issue on the groups page where the placeholder text for no members, mentors, or assignments is the same for all user roles, including admins and students. Conditional rendering is used to display placeholder based on different user roles.

All the languages were kept in mind while changing the placeholder.

The back button is also made to look like button instead of a plain text.

Screenshots

For Admins:

For Students:

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[Darshan808]

There is a slight misunderstanding. The buttons to Add Members/Mentors/Assignments were already present for the admin of the group. But the placeholder text when there are no mentors/members/assignments is displayed the same for admin and members which says "There are no members in this group, click '+ members' to add members". This should not be displayed to students as they aren't authorized to add members. You sent me a screenshot which is the POV of the admin, but the problem is in the POV of the student where placeholder text is the same as Admin's.

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On Thu, 16 May 2024 at 10:42, subham kumar ***@***.***> wrote: @Darshan808 <https://github.com/Darshan808> Add member, Add mentors, Add Assignment already present: image.png (view on web) <https://github.com/CircuitVerse/CircuitVerse/assets/99977240/ca2dcc66-c829-4023-b224-b90ceb483d46> — Reply to this email directly, view it on GitHub <#4938 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/A6MQIQO52B4NI6OVXHI7EKDZCQ4EZAVCNFSM6AAAAABHYFU3ACVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCMJUGAZDQMZSGQ> . You are receiving this because you were mentioned.Message ID: ***@***.***>