In the configuration page admin/og/og, there is incorrect gender grammar. For example "Group creator chooses whether her group appears on the registration form. Defaults to on form." should read "Group creator chooses whether his or her group appears on the registration form. Defaults to on form."
Using grammar like this is often an attempt at addressing sexist aspects of the English language, and if this was intentional I applaud you for integrating such attempts into the software, but it is grammatically incorrect. Another problem that becomes obvious even when the correct grammar is used is that of assuming a gender binary world. There is not a grammatically correct way in English to write inclusively of gender identities that fall outside of male and female.