Some strings cannot be translated in "src/security-widget.vala"

[Luo Lei]

Some strings use "ngettext(" instead of "_(", which caused the translations are not loaded correctly in UI, e.g.
line 43: return ngettext("%u hour", "%u hours", hours).printf(hours);
line 46: return ngettext("%u minute", "%u minutes", minutes).printf(minutes);

[Luo Lei (luolei)]

Delay time settings in line 45-61 in "src/security-widget.vala" are not translatable.