Multilingual Excel filter issue - nothing extracted.

Problem:

user is trying to use multilingual excel file filter and wondering what has been done wrong since there is no text in translation workbench and displays info "This search returned no results".

Solution:

it turned out that source locale of user's project is "English (United States)" but in the multilingual parser configuration there  is no row with columns designated for this language. Wordbee tries to map the target languages with the configuration but the source language must perfectly match.