get rid of flag cdn

install/assets/css/installer.css

@@ -1,6 +1,11 @@
 /*!
  * No overrides for the default theme as it aligns with general.css
 */
+
+body {
+	font-family: "Twemoji Country Flags", "Helvetica", "Comic Sans", serif;
+}
+
 :root {
 	--cl-border-btn-pwd: var(--bs-body-bg);
 }

install/includes/install_config/install_lib.php

@@ -77,6 +77,17 @@ function verify_log() {
     }
 }
 
+function country2flag($code) {
+	$code = strtoupper($code);
+
+	$offset = 0x1F1E6;
+	$code_p1 = $offset + ord($code[0]) - ord('A');
+	$code_p2 = $offset + ord($code[1]) - ord('A');
+
+	$flag = mb_chr($code_p1, 'UTF-8') . mb_chr($code_p2, 'UTF-8');
+	return $flag;
+}
+
 // Function to read the debug logfile
 function read_logfile() {
 	if (verify_log()) {

install/includes/interface_assets/footer.php

@@ -32,6 +32,12 @@
 			location.reload();
 		});
 	</script>
+	<script type="module" defer>
+		import {
+			polyfillCountryFlagEmojis
+		} from "<?php echo base_url(); ?>../assets/js/country-flag-emoji-polyfill.js";
+		polyfillCountryFlagEmojis();
+	</script>
 	<?php
 	/**
 	 * Hidden field to be able to translate the language names

install/index.php

@@ -77,8 +77,7 @@ if (!file_exists('.lock')) {
 											<ul style="list-style-type: none;">
 												<?php foreach ($languages as $lang) { ?>
 													<li>
-														<img src="https://flagcdn.com/w20/<?php echo ($lang['code'] == 'en') ? 'gb' : $lang['flag']; ?>.png">
-														<a href="?lang=<?php echo $lang['gettext']; ?>"><?php echo $lang['name_en']; ?></a>
+														<?php echo country2flag($lang['flag']); ?> <a href="?lang=<?php echo $lang['gettext']; ?>"><?php echo $lang['name_en']; ?></a>
 													</li>
 												<?php } ?>
 											</ul>