show language selector in welcome tab

tabby-core/src/components/welcomeTab.component.pug

@@ -6,6 +6,16 @@
 
     .text-center.mb-5(translate) Thank you for downloading Tabby!
 
+    .form-line
+        .header
+            .title(translate) Language
+        select.form-control([(ngModel)]='config.store.language', (ngModelChange)='config.save()')
+            option([ngValue]='null', translate) Automatic
+            option(
+                [value]='lang.code',
+                *ngFor='let lang of locale.allLanguages'
+            ) {{lang.name|translate}}
+
     .form-line
         .header
             .title(translate) Enable analytics

tabby-core/src/components/welcomeTab.component.ts

@@ -3,6 +3,7 @@ import { Component } from '@angular/core'
 import { TranslateService } from '@ngx-translate/core'
 import { BaseTabComponent } from './baseTab.component'
 import { ConfigService } from '../services/config.service'
+import { LocaleService } from '../services/locale.service'
 import { HostWindowService } from '../api/hostWindow'
 
 /** @hidden */
@@ -17,6 +18,7 @@ export class WelcomeTabComponent extends BaseTabComponent {
     constructor (
         private hostWindow: HostWindowService,
         public config: ConfigService,
+        public locale: LocaleService,
         translate: TranslateService,
     ) {
         super()
@@ -30,6 +32,6 @@ export class WelcomeTabComponent extends BaseTabComponent {
             this.config.store.hotkeys['toggle-window'] = []
         }
         await this.config.save()
-        this.hostWindow.reload()
+        this.destroy()
     }
 }