Thanks for the link. I have read many pages, but not that link. Reading now.
@Hakan, RE: "I have read many pages, but not that link"
What pages did you read that you thought should have the answer that you were seeking, but did not?
Maybe we should add a reference to https://docs.moodle.org/35/en/Language_customisation#Finding_the_component_and_string_identifier there
Actually I had first read the Amos manual, that was helpful with basic info. Then I looked at the moodle doc, but could find anything useful, I tried search feature there that lead me to the Translation page in the Dev docs that was not much helpful. Finally your suggestion for the Language customisation link which further helped.
Btw, guys, thanks for friendly and helpful manner. This forum is great.