Fix translation support

languages/wp-print-friendly.pot

@@ -5,7 +5,7 @@ msgstr ""
 "Project-Id-Version: WP Print Friendly 0.6.3\n"
 "Report-Msgid-Bugs-To: "
 "https://wordpress.org/support/plugin/wp-print-friendly\n"
-"POT-Creation-Date: 2022-06-25 20:55:28+00:00\n"
+"POT-Creation-Date: 2022-06-25 21:01:31+00:00\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=utf-8\n"
 "Content-Transfer-Encoding: 8bit\n"
@@ -25,6 +25,16 @@ msgstr ""
 "X-Textdomain-Support: yes\n"
 "X-Generator: grunt-wp-i18n 1.0.3\n"
 
+#: default-template.php:37
+#. translators: 1. Post permalink.
+msgid "<strong>Source URL:</strong> %1$s"
+msgstr ""
+
+#: default-template.php:57
+#. translators: 1. Copyright year, 2. Site name.
+msgid "Copyright &copy;%1$d %2$s unless otherwise noted."
+msgstr ""
+
 #: wp-print-friendly.php:128
 msgid "Print this entry"
 msgstr ""