Support plural forms for translation ("Quit %d Windows" string)

[xalt7x]

In appIcons.js there's a code which adds taskbar action to Quit applications/windows:

        if (this._source.windowsCount > 0) {
            if (this._source.windowsCount === 1) {
                this._quitMenuItem.label.set_text(_('Quit'));
            } else {
                this._quitMenuItem.label.set_text(__('Quit %d Windows').format(
                    this._source.windowsCount));
            }

Which leaves only one form of plural from translators:

msgid "Quit %d Windows"

For languages like Ukrainian (which can use 3 plural forms), it's impossible to translate this string correctly, covering all possible numbers of windows.

Please add support for the plural forms of this string.

Thanks.

[3v1n0]

Please check if #2102 helps with this