Change language in invoicepdf.tpl

[Abra Fabra]

Client language in profile = 'romanian';

in /templates/six/invoicepdf.tpl
Lang::trans('invoicesdatecreated') = "Data emiterii" //'romanian'

I need output invoicepdf.tpl in english, but not change client language.

Lang::setLocale('english');//Working, BUT not loading /lang/overrides/english.php
Lang::trans('invoicesdatecreated') = "Invoice Date" //english

Lang::setLocale('override_english');//NOT working
Lang::trans('invoicesdatecreated') = "Data emiterii" //'romanian'

How to set english locale with overrides, that Lang::trans('***') return english lang?

Not a nice solution
$language = \WHMCS\Language\ClientLanguage::factory(\WHMCS\Config\Setting::getValue("Language"), 'english', '', false);
$_LANG = $language->toArray();
And change Lang::trans('xxx') to $_LANG['xxx'] in in all places.

Please help)