Minor: Plugin: H5P: Add installation doc info to the plugin description

plugin/h5p/lang/english.php

@@ -1,6 +1,6 @@
 <?php
 $strings['plugin_title'] = "H5P";
-$strings['plugin_comment'] = "Create H5P contents.";
+$strings['plugin_comment'] = "Create H5P contents. Open README.md for installation instructions.";
 $strings['tool_enable'] = "Enable plugin";
 
 $strings['TypeContent'] = "Type of content";

plugin/h5p/lang/french.php

@@ -1,6 +1,6 @@
 <?php
 $strings['plugin_title'] = "H5P";
-$strings['plugin_comment'] = "Ce plugin permet de créer des contenus H5P.";
+$strings['plugin_comment'] = "Ce plugin permet de créer des contenus H5P. Ouvrez le fichier README.md pour des instructions d'installation.";
 $strings['tool_enable'] = "Enable plugin";
 
 $strings['TypeContent'] = "Type de contenu";

plugin/h5p/lang/spanish.php

@@ -1,6 +1,6 @@
 <?php
 $strings['plugin_title'] = "H5P";
-$strings['plugin_comment'] = "Este plugin permite crear contenidos de H5P.";
+$strings['plugin_comment'] = "Este plugin permite crear contenidos de H5P. Abra el README.md para instrucciones de instalación.";
 $strings['tool_enable'] = "Enable plugin";
 
 $strings['TypeContent'] = "Tipo de contenido";