changed deprecated function call to wfMessage()
used the same method to format edit summary as in WikiActivity
added ellipsis with CSS
calculating edit summary width in preview modal
removed truncating on the PHP side
removed unused variable, styleguide changes and most importantly made the "Edit summary:" label bold
Merge branch 'dev' into DAR-2382
added floating to fix the issue in Chrome
addressed CR note
address the whitespace issue found during CR
Merge branch 'dev' into DAR-2382
Merge pull request #1788 from Wikia/DAR-2382

DAR-2382 Fixed edit summary on edit preview