gluon-core, gluon-web-admin: move translations for gluon-info strings to gluon-core

The Lua code was moved, but the translations were not - so regenerating
POT files using i18n-scan.pl would have broken them on the next msgmerge.

Generate new POT files for both gluon-core and gluon-web-admin, msgmerge
the existing translations for both, and adjust gluon.info to request
i18n data from gluon-core.