Add Translate plugin

Examples:

```
<scott> !trans en de Hello! Who are you?
<bot11scott> Hallo! Wer bist du?
<scott> !trans auto en Wo ist Hanna?
<bot11scott> Where is Hanna?
<scott> !detect Les miserablés
<bot11scott> fr
<scott> !langname ko
<bot11scott> Korean
<scott> !langname cy
<bot11scott> Welsh
```