i18n: Fix several reported translation issues

include/class.group.php

include/class.template.php

include/i18n/en_US/help/tips/emails.email.yaml

include/i18n/en_US/help/tips/settings.kb.yaml

include/i18n/en_US/help/tips/settings.pages.yaml

include/i18n/en_US/help/tips/settings.ticket.yaml

include/i18n/en_US/help/tips/staff.staff_members.yaml

include/i18n/en_US/templates/page/landing.yaml

include/staff/dynamic-forms.inc.php

include/staff/dynamic-lists.inc.php

include/staff/settings-access.inc.php

include/staff/templates/user.tmpl.php

include/staff/templates/users.tmpl.php

include/staff/ticket-view.inc.php

scp/js/scp.js

scp/tickets.php