Hello Jakub,
Thank you for posting to the Microsoft community.
I understand that you have Office 2016 installed on your device but you have limited language translation option compared to the Office 2016 installed on your friends device. I'll be providing answer to your request.
The Microsoft Translator feature in your Office 2016 may be showing limited language pairs due to some language packs missing or not installed on your system or the Microsoft translator service might not be fully functional or updated on your machine. To be able to enable more translation languages, do the following:
- Visit the official Microsoft page through this link: Install the Language Accessory Packs for Office 2016 - Microsoft Support
- Download the Language Accessory Pack for each language you want to use
- After installation: >> Open any Office app (e.g., Word). >> Go to File > Options > Language. >> Under Choose Editing Languages, add the new languages. >> Under Choose Display and Help Languages, set your preferences. >> Restart Office apps.
Check Translation Options
>> In Word or Excel, go to Review > Translate > Translation Options.
>> After installing the language packs, you should see more language pairs available.
Hope this helps and if you need further assistance, feel free to reach out.
Best Regards,
Favour | Microsoft Community Support Specialist