Launchpad currently recommends translating gimp in Ubuntu Cosmic.

These templates can be translated using Launchpad.

template name and title
gimp20: Template "gimp20" in Ubuntu Cosmic package "gimp"
gimp20-libgimp: Template "gimp20-libgimp" in Ubuntu Cosmic package "gimp"
gimp20-python: Template "gimp20-python" in Ubuntu Cosmic package "gimp"
gimp20-script-fu: Template "gimp20-script-fu" in Ubuntu Cosmic package "gimp"
gimp20-std-plug-ins: Template "gimp20-std-plug-ins" in Ubuntu Cosmic package "gimp"
gimp20-tips: Template "gimp20-tips" in Ubuntu Cosmic package "gimp"

Other versions of gimp in Ubuntu