Fix up missing-extension message

locale/en.php

@@ -80,10 +80,11 @@ return [
      }',
      // indicates programming error
     'Exception.JKingWeb/Arsse/ExceptionType.typeUnknown'                   => 'Normalization type {0} is  not implemented',
-    'Exception.JKingWeb/Arsse/Exception.extMissing'                        => 'The "{first}" PHP extension {total, plural, offset:1
+    'Exception.JKingWeb/Arsse/Exception.extMissing'                        =>
-        =0 {is}
+        'The "{first}" PHP extension {total, plural, offset:1
-        =1 {and one other extension are}
+            =1    {is}
-        other {and # other extensions are}
+            one   {and # other extension are}
+            other {and # other extensions are}
         } not installed or not enabled.',
     'Exception.JKingWeb/Arsse/Lang/Exception.defaultFileMissing'           => 'Default language file "{0}" missing',
     'Exception.JKingWeb/Arsse/Lang/Exception.fileMissing'                  => 'Language file "{0}" is not available',

tests/cases/TestArsse.php

@@ -61,8 +61,10 @@ class TestArsse extends \JKingWeb\Arsse\Test\AbstractTest {
 
     public function provideExtensionChecks(): iterable {
         return [
-            [["pcre"], null],
+            [["pcre"],              null],
             [["foo", "bar", "baz"], new Exception("extMissing", ['first' => "foo", 'total' => 3])],
+            [["bar", "baz"],        new Exception("extMissing", ['first' => "bar", 'total' => 2])],
+            [["baz"],               new Exception("extMissing", ['first' => "baz", 'total' => 1])],
         ];
     }
 }