Hi Awot,
I guess, you 1) use 6.2.x version and 3) use the translation files in the Donwalods -> resources site (
www.joomlabiblestudy.org/downloads/category/2-resources.html). This files are intended to be for 6.2.x but they are not up to date. (As far as I remember, Tom tried to link the up to date files, but got broken links by the download module
Please use the english language files in the zip file of the component:
For site use \site\languages\en-GB.com_biblestudy.ini
For admin use \admin\languages\en-GB.com_biblestudy.ini
For admin menue use \admin\languages\en-GB.com_biblestudy.menu.ini
For version 7.0, language files are still under development.
Blessings!
Anton