Yes, it is possible to play on different language versions on the same device. In order to check, which language versions are available, go back to the login screen and tab on the flag in the upper right corner.
You will then see all available language versions:
Please be aware, that you will need to create a separate account for each language version you may want to play on. For example: If you want to play on the US and EN version, you will have one account for US and one for EN. Therefore you will also start over again in Stone Age after entering a world.
If you didn't register your account in one version, but want to switch to another language, we advice you to register your account first, or you may lose the access to it. If you already lost access, please contact our support and they will help you to get access again.