Module Easyblogarchive doesn't display months names (MOD_EASYBLOG_ARCHIVE_MONTH_monthname

Hi Mark,

After upgrading Easyblog from J3.9.x to 5.0.19 all does work fine.
In module Easyblogarchive I don't see month name but:
MOD_EASYBLOG_ARCHIVE_MONTH_STYCZEŃ (2)
MOD_EASYBLOG_ARCHIVE_MONTH_LUTY (2)
MOD_EASYBLOG_ARCHIVE_MONTH_MARZEC (1)
MOD_EASYBLOG_ARCHIVE_MONTH_KWIECIEń (1)
MOD_EASYBLOG_ARCHIVE_MONTH_MAJ (1)
MOD_EASYBLOG_ARCHIVE_MONTH_CZERWIEC (2)
MOD_EASYBLOG_ARCHIVE_MONTH_LIPIEC (1)
MOD_EASYBLOG_ARCHIVE_MONTH_SIERPIEń (1)
MOD_EASYBLOG_ARCHIVE_MONTH_WRZESIEń (1)
MOD_EASYBLOG_ARCHIVE_MONTH_PAźDZIERNIK (1)
MOD_EASYBLOG_ARCHIVE_MONTH_LISTOPAD (2)
These are polish names of months.

I checked
en-GB.mod_easyblogarchive.ini & pl-PL.mod_easyblogarchive.ini
and there is a section called ; Settings (something new in version 5.x.x)..
There are translations like:
en-GB.mod_easyblogarchive.ini:
MOD_EASYBLOG_ARCHIVE_MONTH_MARCH="March"
pl-PL.mod_easyblogarchive.ini:
MOD_EASYBLOG_ARCHIVE_MONTH_MARCH="Marzec"

Could you advice me - what I should change?
Thank you!