Admin: Well I had to look up the plural form of Plagiarism and it appears that it is Plagiarisms. Further, currently we have Admin->Plugins->Plagiarism prevention->Manage plagiarism plugins which seems inconsistent. I would recommend removing the word "prevention" as it seems unnecessary.

MDLSITE: I would also recommend being consistent with the plurality and rename the Moodle Plugins category from Plagiarism to Plagiarisms.