Cannot clone same template twice

[syamilmj]

@sarojlakra

Currently the cloned template will be named Template_copy so when cloning the same template you will get the error above.

To do

• instead of just "copy", use "copy_1"
• check for existing template names, and then increase the number accordingly, e.g.:
  • template_copy_1
  • template_copy_2
  • ...