MDL-71889 user: help text for profile field max length/user identity.

lang/en/admin.php

@@ -1010,7 +1010,8 @@
 $string['profilefieldlink'] = 'Link';
 $string['profilefieldlink_help'] = 'To transform the text into a link, enter a URL containing $$, where $$ will be replaced with the text. For example, to transform a Twitter ID to a link, enter https://twitter.com/$$.';
 $string['profilefieldlinktarget'] = 'Link target';
-$string['profilefieldmaxlength'] = 'Maximum length';
+$string['profilefieldmaxlength'] = 'Character limit';
+$string['profilefieldmaxlength_help'] = 'To use this field in the setting \'Show user identity\', the limit must be 255 characters or less.';
 $string['profilefieldrows'] = 'Rows';
 $string['profilefields'] = 'User profile fields';
 $string['profilefieldsize'] = 'Display size';

user/profile/field/text/define.class.php

@@ -32,7 +32,8 @@ class profile_define_text extends profile_define_base {
 
     /**
      * Add elements for creating/editing a text profile field.
-     * @param moodleform $form
+     *
+     * @param MoodleQuickForm $form
      */
     public function define_form_specific($form) {
         // Default data.
@@ -48,6 +49,7 @@ public function define_form_specific($form) {
         $form->addElement('text', 'param2', get_string('profilefieldmaxlength', 'admin'), 'size="6"');
         $form->setDefault('param2', 2048);
         $form->setType('param2', PARAM_INT);
+        $form->addHelpButton('param2', 'profilefieldmaxlength', 'admin');
 
         // Param 3 for text type detemines if this is a password field or not.
         $form->addElement('selectyesno', 'param3', get_string('profilefieldispassword', 'admin'));