feat(locales): include some locales

Partial, and google translated just for the sake of setting an example.
Also renamed many of the language codes where the extra characters are
redundant (i.e. fr-FR, de-DE).

locales/fr.json

@@ -0,0 +1,5 @@
+{
+  "language": "Français",
+  "ui.close": "Fermer",
+  "ui.confirm": "Confirmer"
+}