Quotes page: Show message when trying to approve non-approvable quotes

app/Http/Controllers/ClientPortal/QuoteController.php

@@ -121,7 +121,9 @@ class QuoteController extends Controller
             ->get();
 
         if (!$quotes || $quotes->count() == 0) {
-            return redirect()->route('client.quotes.index');
+            return redirect()
+                ->route('client.quotes.index')
+                ->with('message', ctrans('texts.quotes_with_status_sent_can_be_approved'));
         }
 
         if ($process) {

resources/lang/en/texts.php

@@ -4278,6 +4278,7 @@ $LANG = array(
     'one_time_purchases' => 'One time purchases',
     'recurring_purchases' => 'Recurring purchases',
     'you_might_be_interested_in_following' => 'You might be interested in following',
+    'quotes_with_status_sent_can_be_approved' => 'Only quotes with "Sent" status can be approved.',
 );
 
 return $LANG;