fixed harcoded string "Select a Role"

admin/roles/manage.php

@@ -164,7 +164,7 @@
         
         // prints a form to swap roles
         print ('<form name="rolesform1" action="manage.php" method="post">');
-        print ('<div align="center">Select a Role: ');
+        print ('<div align="center">'.get_string('selectrole').': ');
         choose_from_menu ($roleoptions, 'roleid', $roleid, 'choose', $script='rolesform1.submit()');
         print ('</div></form>');
               

lang/en_utf8/moodle.php

@@ -1155,6 +1155,7 @@ $string['selectacountry'] = 'Select a country';
 $string['selectamodule'] = 'Please select an activity module';
 $string['selectednowmove'] = '$a files selected for moving. Now go to the destination and press \'Move files to here\'';
 $string['selectnos'] = 'Select all \'no\'';
+$string['selectrole'] = 'Select a Role';
 $string['senddetails'] = 'Send my details via email';
 $string['separateandconnected'] = 'Separate and Connected ways of knowing';
 $string['serverlocaltime'] = 'Server\'s local time';