Strings with unexplained placeholders and not ngettext-pluralized

[fitojb]

switchboard-plug-security-privacy/src/Views/FirewallPanel.vala

Line 248 in b8db9fa

from = _("%s Ports %s").printf (rule.from, rule.from_ports.replace (":", "-"));

It is not obvious what these placeholders mean, and they are manually duplicated in a singular version and a plural one, when there are languages that have more or fewer plural forms than English -- ngettext helps here.

[fitojb]

Duplicate of #43