system: fixup scattered gettext() usage in the user manager

(cherry picked from commit a52ec237)

src/www/system_usermanager.php

@@ -172,7 +172,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
             $userdeleted = $a_user[$id]['name'];
             unset($a_user[$id]);
             write_config();
-            $savemsg = gettext("User")." {$userdeleted} ". gettext("successfully deleted");
+            $savemsg = sprintf(gettext('The user "%s" was successfully removed.'), $userdeleted);
             header("Location: system_usermanager.php?savemsg=".$savemsg);
             exit;
         }
@@ -182,8 +182,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
         $certdeleted = $certdeleted['descr'];
         unset($a_user[$id]['cert'][$pconfig['certid']]);
         write_config();
-        $savemsg = gettext("Certificate")." {$certdeleted} ".
-                    gettext("association removed.");
+        $savemsg = sprintf(gettext('The certificate association "%s" was successfully removed.'), $certdeleted);
         header("Location: system_usermanager.php?savemsg=".$savemsg."&act=edit&userid=".$id);
         exit;
     } elseif ($act == "newApiKey" && isset($id)) {
@@ -205,8 +204,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
             $authFactory = new \OPNsense\Auth\AuthenticationFactory();
             $authenticator = $authFactory->get("Local API");
             $authenticator->dropKey($username, $pconfig['api_delete']);
-            $savemsg = gettext("API key")." {$pconfig['api_delete']} ".
-                        gettext("removed.");
+            $savemsg = sprintf(gettext('The API key "%s" was successfully removed.'), $pconfig['api_delete']);
         } else {
             $savemsg = gettext('No API key found');
         }
@@ -221,9 +219,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
             $reqdfieldsn = array(gettext("Username"));
         } else {
             $reqdfields = explode(" ", "usernamefld passwordfld1");
-            $reqdfieldsn = array(
-                gettext("Username"),
-                gettext("Password"));
+            $reqdfieldsn = array(gettext("Username"), gettext("Password"));
         }
 
         do_input_validation($pconfig, $reqdfields, $reqdfieldsn, $input_errors);