Eugen Rochko 1caf11ddcc Fix language filter codes (#4841)
* Fix language filter codes

CLD3 returns BCP-47 language identifier, filter settings expect
identifiers in the ISO 639-1 format. Convert between formats,
and exclude duplicate languages from filter choices (zh-CN->zh)

* Fix zh name
2017-09-08 12:32:22 +02:00
..
2017-07-07 00:48:09 +02:00
2017-01-09 12:37:53 +01:00