[gtk-mac-integration] (10 commits) Non-fast-forward update to branch wip/piotrdrag/l10n-fixes

[Piotr Drąg <piotrdrag src gnome org>]

The branch 'wip/piotrdrag/l10n-fixes' 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:

  bb8a793... Remove unnecessary .pot file
  2bfeb6a... Move Latvian translation to the correct language code
  db6310d... Convert Finnish translation to UTF-8
  2f4b79e... Specify encoding in the .po files
  5763799... Update Polish translation

Commits added to the branch:

  54d4dbb... Remove gettext-generated files. (*)
  43856e5... Silence autopoint error. (*)
  9b53c59... Fix mis-encoding of application name. (*)
  a724575... Fix msgmerge errors. (*)
  6e6aed3... Restore adding "About foo" menu to app menu, provide transl (*)
  ca9174d... Setup gettext in test-integration. (*)
  213ef20... More permanently use "Translators:" to introduce translatio (*)
  7775592... Add function gtkosx_application_set_about_item. (*)
  62a80a6... Move Latvian translation to the correct language code
  7959e53... Update Polish translation

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