[feat] persist user ui customization (#3743)

lnbits/static/js/components/lnbits-theme.js

@@ -9,6 +9,10 @@ window.app.component('lnbits-theme', {
     'g.disclaimerShown'(val) {
       this.$q.localStorage.setItem('lnbits.disclaimerShown', val)
     },
+    'g.locale'(val) {
+      this.$q.localStorage.setItem('lnbits.lang', val)
+      window.i18n.global.locale = val
+    },
     'g.isFiatPriority'(val) {
       this.$q.localStorage.setItem('lnbits.isFiatPriority', val)
     },
@@ -123,6 +127,13 @@ window.app.component('lnbits-theme', {
     if (this.g.mobileSimple === true) {
       document.body.classList.add('mobile-simple')
     }
+    Object.entries(this.g.user.uiCustomization || {}).forEach(
+      ([key, value]) => {
+        if (key in this.g) {
+          this.g[key] = value
+        }
+      }
+    )
     this.checkUrlParams()
   }
 })