i18n: Fixup PHP 7 issues for i18n compiliation

include/cli/modules/i18n.php

setup/test/tests/class.test.php

setup/test/tests/test.extra-whitespace.php

setup/test/tests/test.git-conflicts.php

setup/test/tests/test.jslint.php

setup/test/tests/test.shortopentags.php

setup/test/tests/test.signals.php

setup/test/tests/test.syntax.php

setup/test/tests/test.undefinedmethods.php

setup/test/tests/test.unitialized.php

setup/test/tests/test.var-dump.php