Remove not used file
Merge pull request #972 from sexnothing/develop

Bootstrap files clean
Code cleaning
Fixed bug of article list page
Code cleaning
Merge remote-tracking branch 'upstream/develop' into develop
Fixes errors in case JavaScript/CSS are not loaded with js/css extension
Merge pull request #973 from linzongshu/develop

Fixed bug of article list page
Identifier with single/double quotes of HereDoc/NowDoc prevent poedit from fetching items; @FIXME: PHP version issue?
Update transations for installation
Remove print.css as bootstrap3 already contain it