MDL-29763 portfolio: add helpful description to the page

lang/en/portfolio.php

@@ -107,6 +107,8 @@
 $string['instancenotdelete'] = 'Failed to delete portfolio';
 $string['instancenotsaved'] = 'Failed to save portfolio';
 $string['instancesaved'] = 'Portfolio saved successfully';
+$string['intro'] = 'Content which you have created, such as assignment submissions, forum posts and blog entries, can be exported to a portfolio or downloaded.<br>
+Any portfolio that you do not wish to use may be hidden so that it is not listed as an option to export content to.';
 $string['invalidaddformat'] = 'Invalid add format passed to portfolio_add_button. ({$a}) Must be one of PORTFOLIO_ADD_XXX';
 $string['invalidbuttonproperty'] = 'Could not find that property ({$a}) of portfolio_button';
 $string['invalidconfigproperty'] = 'Could not find that config property ({$a->property} of {$a->class})';
@@ -170,6 +172,7 @@
 $string['selectedformat'] = 'Selected export format';
 $string['selectedwait'] = 'Selected to wait?';
 $string['selectplugin'] = 'Select destination';
+$string['showhide'] = 'Show / hide';
 $string['singleinstancenomultiallowed'] = 'Only a single portfolio plugin instance is available, it doesn\'t support multiple exports per session, and there\'s already an active export in the session using this plugin!';
 $string['somepluginsdisabled'] = 'Some entire portfolio plugins have been disabled because they are either misconfigured or rely on something else that is:';
 $string['sure'] = 'Are you sure you want to delete \'{$a}\'? This cannot be undone.';

user/portfolio.php

@@ -51,6 +51,8 @@
 $namestr = get_string('name');
 $pluginstr = get_string('plugin', 'portfolio');
 $baseurl = $CFG->wwwroot . '/user/portfolio.php';
+$introstr = get_string('intro', 'portfolio');
+$showhide = get_string('showhide', 'portfolio');
 
 $display = true; // Set this to false in the conditions to stop processing.
 
@@ -100,12 +102,14 @@
     echo $OUTPUT->heading($configstr);
     echo $OUTPUT->box_start();
 
+    echo html_writer::tag('p', $introstr);
+
     if (!$instances = portfolio_instances(true, false)) {
         print_error('noinstances', 'portfolio', $CFG->wwwroot . '/user/view.php');
     }
 
     $table = new html_table();
-    $table->head = array($namestr, $pluginstr, '');
+    $table->head = array($namestr, $pluginstr, $showhide);
     $table->data = array();
 
     foreach ($instances as $i) {