Bug 1507468 - Add 'trs' to Firefox Nightly build r=Pike

Differential Revision: https://phabricator.services.mozilla.com/D12208

--HG--
extra : moz-landing-system : lando

browser/locales/all-locales

@@ -94,6 +94,7 @@ te
 th
 tl
 tr
+trs
 uk
 ur
 uz

browser/locales/l10n.toml

@@ -101,6 +101,7 @@ locales = [
     "th",
     "tl",
     "tr",
+    "trs",
     "uk",
     "ur",
     "uz",