Provide a way to manually choose the text resource language

### Feature description

Currently, the language to be picked when creating https://docs.tabris.com/latest/api/TextResources.html#class-textresources is determined from `device.language` and there is no way to give this language manually. Some apps' language configuration might be independent from the device language configuration.

### Proposed solution

Provide an API to manually set the language manually when creating the text resource.