Include "Japanese (vertical)" to list of languages

[karoush1]

Tesseract supports OCR'ing japanese text in vertical mode, and has a trained model in their tessdata(_best) repo.

[karoush1]

Confirmed that adding this single line works by directly changing the code in the Flatpak app location.

Tested:

• [x] Changing code
• [x] Running app to check if anything breaks
• [x] Downloading trained data
• [x] Running Frog on a test image

As can be seen on the image below, it successfully OCR'd the test image.

Accuracy is not 100%, but that is attributed to the image quality and Tesseract itself.

[amka]

Awesome, thank you!