- 'sgn': true, // Sign languages (macro language)
- 'ase': true, // American sign language
- 'sdl': true, // Arabian sign language
- 'bfi': true, // British sign language
- 'bzs': true, // Brazilian sign language
- 'csl': true, // Chinese sign language
- 'cse': true, // Czech sign language
- 'dsl': true, // Danish sign language
- 'fsl': true, // French sign language
- 'gsg': true, // German sign language
- 'pks': true, // Pakistan sign language
- 'jsl': true, // Japanese sign language
- 'sfs': true, // South African sign language
- 'swl': true, // Swedish sign language
- 'rsl': true, // Russian sign language: true
-
- 'epo': true, // Esperanto
- 'tlh': true, // Klingon
- 'jbo': true, // Lojban
- 'avk': true // Kotava
+ sgn: true, // Sign languages (macro language)
+ ase: true, // American sign language
+ sdl: true, // Arabian sign language
+ bfi: true, // British sign language
+ bzs: true, // Brazilian sign language
+ csl: true, // Chinese sign language
+ cse: true, // Czech sign language
+ dsl: true, // Danish sign language
+ fsl: true, // French sign language
+ gsg: true, // German sign language
+ pks: true, // Pakistan sign language
+ jsl: true, // Japanese sign language
+ sfs: true, // South African sign language
+ swl: true, // Swedish sign language
+ rsl: true, // Russian sign language: true
+
+ epo: true, // Esperanto
+ tlh: true, // Klingon
+ jbo: true, // Lojban
+ avk: true // Kotava