Please find below my request for ta_IN (Tamil_INDIA) translation:
WordPress.org username of the administrator: imanickam
Language code: ta
Language name, both the English and the native name: Tamil, தமிழ்
(if applicable) Country code: IN
(if applicable) Country name, both the English and the native name: India, இந்தியா
We can go with either ta (just the language name) or ta_IN (the language name with country name combination.)
Your thoughts please.