Also, the word "extension" should be used instead of "library" as the
library can be installed on the server but it does not automatically
mean PHP can use it.
$string['http'] = 'HTTP';
$string['httpsecurity'] = 'HTTP security';
$string['iconvrecommended'] = 'Installing the optional ICONV library is highly recommended in order to improve site performance, particularly if your site is supporting non-Latin languages.';
-$string['iconvrequired'] = 'Installing the optional ICONV library is required.';
+$string['iconvrequired'] = 'Installing ICONV extension is required.';
$string['ignore'] = 'Ignore';
$string['importlangreminder'] = 'The database migration process is commencing. You will need to <b>log in again</b> for the upgrade to take effect. Please install unicode language packs as soon as possible from Admin->Lang->Lang Import Utility <b>after</b> the database migration process is completed.';
$string['importtimezones'] = 'Update complete list of timezones';