Modify this to `translation` to get better pipeline support

This **is** a breaking change, since for `pipeline` the return type will be modified (from `[{"generated_text": ...}]` to `[{"translated_text": ...}] `

Other than that it will enable using `src_lang` and `tgt_lang` which are necessary to control the translation for this model.

README.md

@@ -201,6 +201,7 @@ language_details: "ace_Arab, ace_Latn, acm_Arab, acq_Arab, aeb_Arab, afr_Latn, a
 
 tags:
 - nllb
+- translation
 license: "cc-by-nc-4.0"
 datasets:
 - flores-200