Change strings of plugin-/modulename to collaborative folder (without "s")

Author: justusdieckmann

lang/en/collaborativefolders.php

@@ -25,18 +25,18 @@
 defined('MOODLE_INTERNAL') || die();
 
 // General.
-$string['modulename'] = 'Collaborative folders';
+$string['modulename'] = 'Collaborative folder';
 $string['modulenameplural'] = 'Collaborative folders';
 $string['modulename_help'] = 'Use collaborative folders to create folders in the cloud (ownCloud, Nextcloud) for students for collaborative work. The folder is shared individually with members of the chosen groups as soon as they like. You do not need to collect any email addresses from your participants, everything is automated!';
 $string['cachedef_token'] = 'OAuth system client token';
 $string['cachedef_userinfo'] = 'OAuth user client user info';
 $string['collaborativefolders:addinstance'] = 'Add a new collaborative folder';
 $string['collaborativefolders:view'] = 'View a collaborative folder';
 $string['collaborativefolders:isteacher'] = 'When viewing, be considered a non-student (with restricted access)';
-$string['collaborativefolders'] = 'Collaborative folders';
-$string['nocollaborativefolders'] = 'No instance of collaborative folders is active in this course.';
-$string['pluginadministration'] = 'Administration of collaborative folders';
-$string['pluginname'] = 'Collaborative folders';
+$string['collaborativefolders'] = 'Collaborative folder';
+$string['nocollaborativefolders'] = 'There are no collaborative folders in this course.';
+$string['pluginadministration'] = 'Collaborative folder administration';
+$string['pluginname'] = 'Collaborative folder';
 
 // View: Overview.
 $string['activityoverview'] = 'Collaborative folder';