If this helps, this is the current error message we are receiving when trying to install ouwiki on core version 2.0.2 (just tested yesterday):
Invalid get_string() identifier: 'modulename' or component 'ouwiki'
- line 5863 of /lib/moodlelib.php: call to debugging()
- line 6418 of /lib/moodlelib.php: call to core_string_manager->get_string()
- line 9611 of /lib/moodlelib.php: call to get_string()
- line 6138 of /lib/adminlib.php: call to get_plugin_name()
- line 280 of /admin/index.php: call to print_plugin_tables()
If this helps, this is the current error message we are receiving when trying to install ouwiki on core version 2.0.2 (just tested yesterday):
Invalid get_string() identifier: 'modulename' or component 'ouwiki'