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

Conflicts:

	program/include/rcmail.php

CHANGELOG

@@ -10,6 +10,7 @@ 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 1.0.6
 -------------

program/include/rcmail.php

@@ -175,9 +175,11 @@ 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 (version_compare(PHP_VERSION, '5.5.0', '<') && in_array($lang, array('tr_TR', 'ku', 'az_AZ'))) {
-            setlocale(LC_CTYPE, 'en_US.utf8', 'en_US.UTF-8');
+        // Workaround for http://bugs.php.net/bug.php?id=18556
+        // Also strtoupper/strtolower and other methods are locale-aware
+        // for these locales it is problematic (#1490519)
+        if (in_array($lang, array('tr_TR', 'ku', 'az_AZ'))) {
+            setlocale(LC_CTYPE, 'en_US.utf8', 'en_US.UTF-8', 'C');
         }
     }