Changes table elements ui and adds loader to tabs

[fishcodeslol]

Issue #5 Issue #9 Issue #10

• Updated table elements
• Hide admin panel when Mentor user is editing comments
• Add cancel button for Mentor user in edit mode
• Added loader to table header (needs to be optimized, updated Issue #10 )

Before:

After:

[prog-z-99]

Wait a minute why is that using the main DB