Multilingual Site Problem with Menu

I have created a site for a company in grav cms using grantry 5 helium theme. I am trying to create multilanguage site following your grav documentation instructions. I have created two .md files for each page one for en language and one for gr language i.e. files end with en.md and gr.md inside each page folder. Everything works fine except the main menu. In menu everything gets translated according to language selection except "Home". Home don't translate and is displayed as "Home" in both languages.
I have a 01.home directory and inside it two files default.en.mg and default.gr.md with the following content:

default.en.md
---
title: 'Home'
---

default.gr.md
---
title: 'Αρχική'
---

However 'Αρχική' never gets displayed in when visiting site/gr only 'Home'

Any suggestions??

Thanks a lot solution by maria in post 7 worked like a charm.