Fix various issues with Turkish (and similar) locales (#1490519)

CHANGELOG

@@ -57,6 +57,7 @@ CHANGELOG Roundcube Webmail
 - Fix so adding CC/BCC recipients from the sidebar unhides compose form fields in Classic skin (#1490472)
 - Fix so gc.sh script removes also expired sessions from sql database (#1490512)
 - Fix support for Mozilla-based browsers, e.g. Pale Moon (#1490517)
+- Fix various issues with Turkish (and similar) locales (#1490519)
 
 RELEASE 1.1.2
 -------------

program/include/rcmail.php

@@ -178,8 +178,10 @@ class rcmail extends rcube
         // set localization
         setlocale(LC_ALL, $lang . '.utf8', $lang . '.UTF-8', 'en_US.utf8', 'en_US.UTF-8');
 
-        // workaround for http://bugs.php.net/bug.php?id=18556
-        if (PHP_VERSION_ID < 50500 && in_array($lang, array('tr_TR', 'ku', 'az_AZ'))) {
+        // Workaround for http://bugs.php.net/bug.php?id=18556
+        // Also strtoupper/strtolower and other methods are locale-aware
+        // for these locales it is problematic (#1490519)
+        if (in_array($lang, array('tr_TR', 'ku', 'az_AZ'))) {
             setlocale(LC_CTYPE, 'en_US.utf8', 'en_US.UTF-8');
         }
     }