Log Message:
devel/ruby-gettext-setup: update to 0.30

0.29				2017/11/30

* (FM-6323) - Copying Ruby POT rather than moving it
* (FM-6415) create header_only option for pot generation
* (INTL-31) Refactor rake tasks to not setup FastGettext runtime

0.30				2018/02/13

* (GH-61) Handle initial nil value