Clean up appearance of Rename Discussion modal
Clean up appearance of Rename Discussion modal

Also fix infinite loading if there's a validation error.

Luceos/core,malayladu/core,Luceos/core,flarum/core,malayladu/core,flarum/core,datitisev/core,datitisev/core,datitisev/core,Luceos/core,datitisev/core,malayladu/core,malayladu/core,flarum/core,Luceos/core