Update en-GB.com_simplerenew.ini

I added COM_SIMPLERENEW_NO_MATCHING_RESULTS="You don't currently have any subscription plans. Why not click "New" and create a plan?"
Update default.php

I changed JGLOBAL_NO_MATCHING_RESULTS to COM_SIMPLERENEW_NO_MATCHING_RESULTS
Issue #276 - Fix critical problem with user group management
Closes #279 - Display coupon information on page load
Closes #264 - Improved email validation
Merge branch 'patch-4' of github.com:Bfstepha/Simplerenew into Bfstepha-patch-4

Conflicts:
	src/site/language/en-GB/en-GB.com_simplerenew.ini