Not compatible with Polylang plugin (suggest any alternative?)

[boamaod]

I tried configuring Polylang which to my mind is a standard way of creating multilingual sites in WordPress, but at first impression it seems not compatible with ISOC theme. The problems appeared:

• Showing different language content using language code in address doesn't work (no effect).
• Menu bar disappears altogether (no matter if I choose address with language code or not).
• Selecting Estonian as default language doesn't work, user will be still directed to site with English language code in address, going to site with Estonian leads to "not found" error.

Is it worth continuing experimentation at this point?

[boamaod]

Any comments on that? Is hardcoding the language really the only option?