GET v3/languages
will return all the languages of account.
[
{
"language": "en",
"title": "English"
},
{
"language": "fr",
"title": "French"
},
{
"language": "de",
"title": "German"
},
{
"language": "pl",
"title": "Polish"
},
{
"language": "pt",
"title": "Portuguese"
},
{
"language": "es",
"title": "Spanish"
}
]