Ok - those strings aren't in core Moodle so how did they get there? It implies that you downloaded Moodle from somewhere other than moodle.org. This is not recommended.
The solution is probably to replace your Moodle code with the "official" version but it's hard to give better advice until we know what you did.
The solution is probably to replace your Moodle code with the "official" version but it's hard to give better advice until we know what you did.
