liquid_feedback_frontend: locale/help/initiative.revoke.en.txt annotate

liquid_feedback_frontend

Added missing brackets

rev	line source
Dinu@59	1 =Revoke initiative=
Dinu@59	2 You can revoke this initiative. This cannot be rolled back, but you can, of course, start a new initiative anytime. You can recommend the supporters an alternative initiative. For doing so you are offered all initiatives supported by you.