MDL-72093 booktool_exportimscp: Replace strings in secondary nav

mod/book/tool/exportimscp/lang/en/booktool_exportimscp.php

@@ -26,7 +26,9 @@ defined('MOODLE_INTERNAL') || die;
 
 $string['eventbookexported'] = 'Book exported';
 $string['exportimscp:export'] = 'Export book as IMS content package';
-$string['generateimscp'] = 'Generate IMS CP';
 $string['nochapters'] = 'No book chapters found, so unable to export to IMS CP.';
 $string['pluginname'] = 'Book IMS CP export';
 $string['privacy:metadata'] = 'The Book IMS CP export plugin does not store any personal data.';
+
+// Deprecated since Moodle 4.0.
+$string['generateimscp'] = 'Generate IMS CP';

mod/book/tool/exportimscp/lang/en/deprecated.txt

@@ -0,0 +1 @@
+generateimscp,booktool_exportimscp

mod/book/tool/exportimscp/lib.php

@@ -36,6 +36,6 @@ function booktool_exportimscp_extend_settings_navigation(settings_navigation $se
     if (has_capability('booktool/exportimscp:export', $PAGE->cm->context)) {
         $url = new moodle_url('/mod/book/tool/exportimscp/index.php', array('id'=>$PAGE->cm->id));
         $icon = new pix_icon('generate', '', 'booktool_exportimscp', array('class'=>'icon'));
-        $node->add(get_string('generateimscp', 'booktool_exportimscp'), $url, navigation_node::TYPE_SETTING, null, null, $icon);
+        $node->add(get_string('download'), $url, navigation_node::TYPE_SETTING, null, null, $icon);
     }
 }