Hotfix BUILD constants with custom pre-release informations.
HOTFIX: handle BUILD constants with custom pre-release information even more properly.
Fix a warning when composer update is required.
Merge branch 'master' into develop

Conflicts:
	src/system/modules/!composer/ContaoCommunityAlliance/Contao/Composer/ClientBackend.php
	src/system/modules/!composer/ContaoCommunityAlliance/Contao/Composer/Runtime.php
Add transifex configuration settings.