Use the same form everywhere: "TRANSLATORS" instead of "Translators".
The manual also seems to prefer the upper-case form [1].

  $ sed 's/\<Translators\>: /TRANSLATORS: /g' $(git grep -l Translators) -i

[1] https://www.gnu.org/software/gettext/manual/gettext.html

https://bugzilla.gnome.org/show_bug.cgi?id=786131

From the Red Hat translators. Fix up the bad msgmerge.

And make -C po update-po to canonicalize them.