Instructions to delete a language to Ephone devices

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 EP13 Ephone EP13
Ephone G3A Ephone G3A
Ephone X6 Panda Ephone X6 Panda