Import gettext-0.19.
Partially revert "Minor update to bundled gettext."

This reverts the part of commit f030232d9f4e37d07d38432c6e7135cb47bd0a92
that applies PHP parsing patch.
Update Gettext to 0.19.

Merge branch 'vendor/gettext' into stable.
Update NuGet package version for gettext.
Update Xcode build step to use .version instead of version.sh.
Fix gettext install errors.
Fix needless gettext sources modifications.

Again. Sigh.
Gettext 0.19 checks Language-Team values, fix them.
Merge branch 'refs/heads/gettext-0.19' into stable
Ship msguniq with bundled gettext.

msguniq is useful for manually fixing broken PO(T) files.

No UI to do this yet, but it will still be useful.
Import gettext-0.19.1.
Update Gettext to 0.19.1.

Merge branch 'vendor/gettext' into stable