Rename "Chinese (Jin)" into "Jin Chinese"
Rename "Chinese (Jin)" into "Jin Chinese"

Now that we have the searchable language selector,
there is no need to have Jin confusignly between parenthesis.

Closes #2318

Tatoeba/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2