Issue #2015789 by fubhy, echoz, rteijeiro, LewisNyman, penyaskito: Remove language_css_alter() (RTL stylesheets) in favor of HTML 'dir' attribute.
Merge pull request #334 from quicksketch/adamtothemoon-207-remove-lang-alter

Issue #2015789 by fubhy, echoz, rteijeiro, LewisNyman, penyaskito: Remove language_css_alter() (RTL stylesheets) in favor of HTML 'dir' attribute.
Issue #3: Replace 'drupal' with 'backdrop' throughout PHP code.