chore(l10n): Add (eu, scn) and remove (et) locales from production

Because:

* Two new locales have exceeded the translation completion threshold to be enabled
* One locale has passed under the threshold to be disabled

This commit:

* Adds/removes the locales from supported-languages.json

Author: bcolsson

libs/shared/l10n/src/lib/supported-languages.json

@@ -15,7 +15,7 @@
   "es-CL",
   "es-ES",
   "es-MX",
-  "et",
+  "eu",
   "fi",
   "fr",
   "fur",
@@ -43,6 +43,7 @@
   "pt-PT",
   "rm",
   "ru",
+  "scn",
   "sk",
   "sl",
   "sq",