English grammar fixes, punctuations, etc

English grammar fixes, punctuations, etc

Fixes for following bug reported threads:

https://community.woltlab.com/thread/247350-ready-grammar-use-punctuation-wcf-general-areas/

https://community.woltlab.com/thread/247707-ready-grammar-use-punctuation-acp-maintenance-rebuild-data/

https://community.woltlab.com/thread/247348-language-wcf-acp-group-option-category-mod/

https://community.woltlab.com/thread/247090-language-wcf-acp-option-user-cleanup-notification-lifetime/

https://community.woltlab.com/thread/247614-language-wcf-acp-paidsubscription-usergroups-wcf-acp-paidsubscription-usergroups/