Fix for email templates

app/Http/Controllers/AccountController.php

@@ -1386,18 +1386,17 @@ class AccountController extends BaseController
     public function previewEmail(TemplateService $templateService)
     {
         $template = Input::get('template');
-        $invoice = Invoice::scope()
-                    ->invoices()
-                    ->withTrashed()
-                    ->first();
+        $invitation = \App\Models\Invitation::scope()
+                        ->with('invoice.client.contacts')
+                        ->first();
 
-        if (! $invoice) {
+        if (! $invitation) {
             return trans('texts.create_invoice_for_sample');
         }
 
         /** @var \App\Models\Account $account */
         $account = Auth::user()->account;
-        $invitation = $invoice->invitations->first();
+        $invoice = $invitation->invoice;
 
         // replace the variables with sample data
         $data = [

resources/lang/en/texts.php

@@ -2416,7 +2416,7 @@ $LANG = array(
     'online_payment_surcharge' => 'Online Payment Surcharge',
     'gateway_fees' => 'Gateway Fees',
     'fees_disabled' => 'Fees are disabled',
-    'gateway_fees_help' => 'Automatically add an online payment surcharge or line item.<br/>Surcharges aren\'t affected by discounts, line item supports partial payments.',
+    'gateway_fees_help' => 'Automatically add an online payment surcharge or line item.<br/>Surcharges aren\'t affected by discounts, line items support partial payments.',
     'gateway' => 'Gateway',
     'gateway_fee_change_warning' => 'If there are unpaid invoices with fees they need to be removed to prevent duplicate fees from being charged.',
     'fees_surcharge_help' => 'Customize surcharge :link.',