ether/etherpad-lite — pull request #2265 by prtksxna (2014-10-11 17:21:59+00:00)
Title: Add 'Ctrl-5' keyboard shortcut for 'strikethrough' #1987

A quick search revealed that 'Ctrl-5' is a popular shortcut
for strikethrough. Implemented in 'ace2_inner' and updated
the English l10n file for the tooltip.

Also removed extra whitespaces.