Merge branch 'master' into filesystem

core/js/js.js

core/js/router.js

core/l10n/ar.php

core/l10n/cs_CZ.php

core/l10n/fi_FI.php

core/l10n/ja_JP.php

core/l10n/nl.php

core/l10n/ru_RU.php

core/l10n/sv.php

core/l10n/ta_LK.php

core/templates/layout.base.php

core/templates/layout.guest.php

core/templates/layout.user.php

l10n/ar/core.po

l10n/ar/lib.po

l10n/bg_BG/core.po

l10n/bg_BG/lib.po

l10n/ca/core.po

l10n/ca/lib.po

l10n/cs_CZ/core.po