[Plugin Polylang] Tempera theme – frontpage text translation

Hi all,
I have a problem with translating strings added to frontpage using the extra options tab in theme settings. I’ve found several topics from this forum but all of them apply to other themes. Sorry for writing a new topic but I can’t manage to solve the problem After a few hours of trying i gave up.
I know that I must create a wpml-config.xml file. but what exactly should I write in it (according to my theme)?
I’m trying to translate the text from frontpage (Tempera Settings -> Frontpage -> Addons -> “Main title” and “main text”)
Thank’s for any help.
And sorry for my poor english 😉