[gimp] (5 commits) Non-fast-forward update to branch nielsdg/gi-docgen

[Jehan <jehanp src gnome org>]

The branch 'nielsdg/gi-docgen' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  050c74a... docs: Migrate from gtk-doc to gi-docgen

Commits added to the branch:

  273178a... Update POTFILES.in (*)
  6e5414b... Update Polish translation (*)
  d2d7c8b... Update Chinese (China) translation (*)
  72f0c9e... NEWS: update. (*)
  18b9a3a... docs: Migrate from gtk-doc to gi-docgen

(*) This commit already existed in another branch; no separate mail sent