Paid extensions (#2229)

* fix: download archive file `async`

* feat: add `pay_link` property

* feat: basic install using internal wallet for payment

* fix: pop-up issues

* chore: refactor

* feat: detect paid extensions

* fix: payment check

* feat: small stuff

* feat: show external invoice

* fix: regression for extension install

* feat: store previos successful payments

* refactor: simplify, almost works

* chore: gugu gaga

* fix: pay and install

* fix: do not pay invoice on the back-end

* chore: code clean-up

* feat: basic websocker listener

* feat: use websocket to watch for invoice payment

* feat: remember hanging invoices

* refactor: extract `localStorage` methods

* chore: code format

* chore: code clean-up after test

* feat: remember previous payment_hashes

* chore: code format

* refactor: rename `ExtensionPaymentInfo` to `ReleasePaymentInfo`

* refactor: method rename

* fix: release version matters now

* chore: code format

* refactor: method rename

* refactor: extract method `_restore_payment_info`

* refactor: extract method

* chore: rollback `CACHE_VERSION`

* chore: code format

* feat: i18n

* chore: update bundle

* refactor: public method name

* chore: code format

* fix: websocket connection

* Update installation.md (#2259)

* Update installation.md (#2260)

* fix: try to fix `openapi` error

* chore: bundle

* chore:bundle

---------

Co-authored-by: benarc <ben@arc.wales>
Co-authored-by: Arc <33088785+arcbtc@users.noreply.github.com>

lnbits/static/i18n/en.js

@@ -239,5 +239,12 @@ This service is in BETA. LNbits holds no responsibility for loss of access to fu
   logout: 'Logout',
   look_and_feel: 'Look and Feel',
   language: 'Language',
-  color_scheme: 'Color Scheme'
+  color_scheme: 'Color Scheme',
+  extension_cost: 'This release requires a payment of minimum %{cost} sats.',
+  extension_paid_sats: 'You have already paid %{paid_sats} sats.',
+  release_details_error: 'Cannot get the release details.',
+  pay_from_wallet: 'Pay from Wallet',
+  show_qr: 'Show QR',
+  retry_install: 'Retry Install',
+  new_payment: 'Make New Payment'
 }