Plural rules are not updated when setLanguage() executed

[OleksandrSemenov]

Subj.
Error is here:
...
// initialize _pluralRules
if (!gMacros._pluralRules) {
gMacros._pluralRules = getPluralRules(gLanguage);
}
...
so, pluralRules are intializaed only once.
To fix it, remove if statement:
...
// initialize _pluralRules
gMacros._pluralRules = getPluralRules(gLanguage);
...

[Rob--W]

Patches are welcome. The proper fix is not to unconditionally call getPluralRules, but call getPluralRules again in setLanguage if the language changed.