GettextLocalizations.fromPO constructor
Write the translations from a PO file String to the Gettext instance.
onWarning receives a message for every msgid that has no translation
in a non-English locale. Defaults to print. Pass null to silence the
warnings, or your own sink to redirect them.
Implementation
GettextLocalizations.fromPO(String poContent, {OnWarning? onWarning = print})
: _gt = Gettext(onWarning: onWarning) {
_gt.addLocale(po.parse(poContent));
}