Pro sites plugin + polylang

Hello,
We have a multisite system with 4 languages.
In the main website we have the pro sites plugin and we can't translate for example for portuguese.
We are using the poedit to create the translations. We have stored the translation file in:
/wp-content/plugins/pro-sites/pro-sites-files/languages/psts-pt_PT.po

We are configuring this page http://a3vteshop.com/adira-ja/ in portuguese but it's not translating correctly, the first sentence:
"You must first login before you can choose a site to upgrade:"
should be "Você precisa fazer login primeiro antes de poder escolher um site para atualizar:"

We are using the polylang plugin for translations and all the plugins works fine less the pro sites plugin. Can you check for us?