email brand hygiene (#11)

implements proper email hygiene, including templates and a language .json

Reviewed-on: #11
Co-authored-by: vickydotbat <vickydotbat@tutamail.com>
Co-committed-by: vickydotbat <vickydotbat@tutamail.com>

plugin.json

@@ -12,6 +12,7 @@
   ],
   "scripts": ["public/client.js", "../nodebb-theme-harmony/public/harmony.js"],
   "templates": "templates",
+  "languages": "languages",
   "modules": {
     "../admin/plugins/theme-quickstart.js": "../nodebb-theme-harmony/public/admin.js",
     "../client/account/theme.js": "../nodebb-theme-harmony/public/settings.js"