Add service fee to specific wallet (#2050)

* add service fee to specific wallet

* add to .env.example

* Added service fee wallet to manage server

* cleaned

* prettier

* Added badge for service fee

* Added tooltip

* Added service fee max

* allow ignoring service fee for internal transactions

* add fee_reserve_total helper funciton that includes service_fee

* html for admin ui

* typo

* Update .env.example

Co-authored-by: Pavol Rusnak <pavol@rusnak.io>

* fix .env.template comment

* bundle

* WIP: expose fee reserve endpoint

---------

Co-authored-by: Arc <ben@arc.wales>
Co-authored-by: dni ⚡ <office@dnilabs.com>
Co-authored-by: Pavol Rusnak <pavol@rusnak.io>

lnbits/static/i18n/en.js

@@ -54,6 +54,10 @@ window.localisation.en = {
   view_github: 'View on GitHub',
   voidwallet_active: 'VoidWallet is active! Payments disabled',
   use_with_caution: 'USE WITH CAUTION - %{name} wallet is still in BETA',
+  service_fee: 'Service fee: %{amount} % per transaction',
+  service_fee_max: 'Service fee: %{amount} % per transaction (max %{max} sats)',
+  service_fee_tooltip:
+    'Service fee charged by the LNbits server admin per outgoing transaction',
   toggle_darkmode: 'Toggle Dark Mode',
   view_swagger_docs: 'View LNbits Swagger API docs',
   api_docs: 'API docs',