A minor language line correction.

Author: ivantcholakov

application/language/english/rest_controller_lang.php

@@ -9,7 +9,7 @@
 $lang['text_rest_ip_denied'] = 'IP denied';
 $lang['text_rest_ip_unauthorized'] = 'IP unauthorized';
 $lang['text_rest_unauthorized'] = 'Unauthorized';
-$lang['text_rest_ajax_only'] = 'Only Ajax requests are only allowed';
+$lang['text_rest_ajax_only'] = 'Only AJAX requests are allowed';
 $lang['text_rest_api_key_unauthorized'] = 'This API key does not have access to the requested controller';
 $lang['text_rest_api_key_permissions'] = 'This API key does not have enough permissions';
 $lang['text_rest_api_key_time_limit'] = 'This API key has reached the time limit for this method';