Update translations.md (#2538)

Remove duplicate line containing details about language translation and
it's contributors.

src/running-the-course/translations.md

@@ -16,8 +16,6 @@ volunteers:
 - [Korean][ko] by [@keispace], [@jiyongp], [@jooyunghan], and [@namhyung].
 - [Spanish][es] by [@deavid].
 - [Ukrainian][uk] by [@git-user-cpp], [@yaremam] and [@reta].
-- [Farsi][fa] by [@DannyRavi], [@javad-jafari], [@Alix1383], [@moaminsharifi],
-  [@hamidrezakp] and [@mehrad77].
 
 Use the language picker in the top-right corner to switch between languages.