Instructions to delete a language to Ephone devices

Ephone EP1 Gift Ephone EP1 Gift
Ephone EP1 Ace Plus Ephone EP1 Ace Plus
Ephone E61 Ephone E61
Ephone E19 Quad Core Ephone E19 Quad Core
Ephone E17 3G Ephone E17 3G
Ephone E13 3G Ephone E13 3G
Ephone E1 Smile Ephone E1 Smile
Ephone A23VIP Ephone A23VIP
Ephone 520 Ephone 520