Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.

Issue #1996644 by abghosh82 | joachim: Fixed user_login_name_validate() uses isset() where other user login form validation handlers use !empty().

Issue #1938184 by Xano, ParisLiakos, franskuipers, clemens.tolboom: Convert Drupal\Core\Utility\Color\ColorTest to PHPUnit.

Issue #1843744 by joelpittet, kgoel, Hydra, tsi, chrisjlee, shanethehat, jenlampton, mr.baileys, Cottser, socketwench: Convert views/templates/views-view.tpl.php to twig .

This reverts commit 4f6113f5.

Issue #1843748 by tlattimore, shanethehat, geoffreyr, Cottser, Hydra, joelpittet, widukind, c4rl, rcaracaus: Convert views/templates/views-view-fields.tpl.php to twig.

Issue #2003578 followup by chx: twig_cache() must be FALSE in install.php registerTwig because we don't know if files folder is writable yet.

Issue #2003578 by Jon Pugh, joelpittet: Fixed twig_cache() must be FALSE in install.php registerTwig because we don't know if files folder is writable yet.

Issue #1938840 by chrisjlee, duellj, Cottser, shanethehat, idflood, tlattimore: Bartik.theme - Convert PHPTemplate templates to Twig.

Issue #1898062 by c4rl, jenlampton, shlapa, joelpittet, Cottser, duellj, swentel: Convert field module to Twig.

Issue #1843746 by joelpittet, trrroy, shanethehat, tlattimore, damiankloip, jastraat, dawehner, thedavidmeister, Cottser, Kevin Morse: Convert views/templates/views-view-field.tpl.php to Twig .

Issue #1843764 by joelpittet, Cottser, dmouse, shanethehat, jwilson3: Convert views/templates/views-view-summary-unformatted.tpl.php to twig.

Issue #1843752 by joelpittet, Sean Charles: Convert views/templates/views-view-grouping.tpl.php to twig.

Issue #1843742 by chrisjlee, joelpittet, 2ndmile: Convert views/templates/views-more.tpl.php to twig.

Issue #1843762 by joelpittet, Albert Volkman, shrop: Convert views/templates/views-view-summary.tpl.php to twig.

Issue #1843750 by jastraat, joelpittet, jpamental, FluxSauce, gollyg, shanethehat, mr.baileys: Convert views/templates/views-view-grid.tpl.php to twig.

Issue #1843740 by webthingee, joelpittet, Hydra, thund3rbox, shrop: Convert views/templates/views-exposed-form.tpl.php to twig.

Issue #1843760 by webthingee, joelpittet, jpamental: Convert views/templates/views-view-rss.tpl.php to twig.

Issue #1843758 by joelpittet, jpamental, tlattimore: Convert views/templates/views-view-row-rss.tpl.php to twig.

Issue #1843774 by joelpittet, chrisjlee, steveoliver, shanethehat: Convert views/views_ui()/templates/views-ui-display-tab-setting.tpl.php to Twig.

Issue #1843772 by joelpittet, steveoliver, 2ndmile, Cottser | tostinni: [READY] Convert views/views_ui()/templates/views-ui-display-tab-bucket.tpl.php to Twig.

Issue #1898034 by Cottser, jenlampton, joelpittet, Shawn DeArmond, idflood, Hydra, artofeclipse, rich.yumul, chrisjlee, gnuget, c4rl, thund3rbox: block.module - Convert PHPTemplate templates to Twig.

Issue #1898432 by WebDevDude, steveoliver, vlad.dancer, jenlampton, pixelmord, Fabianx, iztok, EVIIILJ, jwilson3, c4rl, Cottser: Convert node module to Twig.

Issue #1898054 by pixelmord, jenlampton, steveoliver, EVIIILJ, c4rl, vlad.dancer, Fabianx, joelpittet, jwilson3, thedavidmeister, shanethehat, Cottser: Convert comment module to Twig.

Issue #1898454 by c4rl, gnuget, Hydra, mr.baileys, Sean Charles, joelpittet: system.module - Convert PHPTemplate templates to Twig.

Issue #1898418 by Cottser, shanethehat, c4rl, joelpittet, disasm, Floydm, jenlampton: forum.module - Convert PHPTemplate templates to Twig.

Issue #1898424 by joelpittet, duellj, Cottser, mr.baileys: layout.module - Convert PHPTemplate templates to Twig.

Issue #1896060 by shanethehat, Cottser, joelpittet, disasm, ParisLiakos, Floydm, stevector, jenlampton, c4rl, mr.baileys, thedavidmeister, jwilson3: aggregator.module - Convert PHPTemplate templates to Twig.

Issue #1898468 by Cottser, joelpittet, rteijeiro, c4rl, steveoliver, scor, jenlampton, idflood, shanethehat, thedavidmeister: [READY] user.module - Convert PHPTemplate templates to Twig.

Issue #1898050 by duellj, Cottser, meeli, dsdart, Fabianx | c4rl: book.module - Convert PHPTemplate templates to Twig.

Issue #1938848 by Jaesin, Cottser, jenlampton, hefox, Shawn DeArmond, frob, boze, joelpittet, mrf, dcrocks: seven.theme - Convert PHPTemplate templates to Twig.