[ui] update settings UI (#2767)

lnbits/static/i18n/en.js

@@ -2,6 +2,7 @@ window.localisation.en = {
   confirm: 'Yes',
   server: 'Server',
   theme: 'Theme',
+  site_customisation: 'Site Customisation',
   funding: 'Funding',
   users: 'Users',
   apps: 'Apps',

lnbits/static/js/admin.js

@@ -58,6 +58,7 @@ window.app = Vue.createApp({
         'orange'
       ],
       tab: 'funding',
+      tabsPercent: 15,
       needsRestart: false
     }
   },