Add Akkadian language

[wincentbalin]

Hello everybody,

I would like to ask you to add support for Akkadian language. Recently, a model for it was added to the tesseract-ocr/tessdata_contrib repository.

These are the links to model files:

• Fast model: https://github.com/tesseract-ocr/tessdata_contrib/raw/main/akk/fast/akk.traineddata
• Best model: https://github.com/tesseract-ocr/tessdata_contrib/raw/main/akk/best/akk.traineddata
• Legacy (for Tesseract 3.04) model: https://github.com/tesseract-ocr/tessdata_contrib/raw/main/akk/legacy/akk.traineddata

To use these models, the source URLs here have to be converted to arrays, as well as the code using it.

This addition also allows the app to use additional languages, for example Santali, like Text Fairy app does here.

[wincentbalin]

As the type of the model for Santali is not clear, I would refrain to add it yet.