Move UI configs to profile (#2201)

* feat: add tabs

* feat: move buttons to user profile

* feat: i18n

* refactor: move ui methods to `account` component

lnbits/static/js/base.js

@@ -422,21 +422,10 @@ window.windowMixin = {
   },
 
   methods: {
-    activeLanguage: function (lang) {
-      return window.i18n.locale === lang
-    },
-    changeLanguage: function (newValue) {
-      window.i18n.locale = newValue
-      this.$q.localStorage.set('lnbits.lang', newValue)
-    },
     changeColor: function (newValue) {
       document.body.setAttribute('data-theme', newValue)
       this.$q.localStorage.set('lnbits.theme', newValue)
     },
-    toggleDarkMode: function () {
-      this.$q.dark.toggle()
-      this.$q.localStorage.set('lnbits.darkMode', this.$q.dark.isActive)
-    },
     copyText: function (text, message, position) {
       var notify = this.$q.notify
       Quasar.utils.copyToClipboard(text).then(function () {