Add language detection results

Makefile

...ut-ocr-google-hires.language-detection-page-results-hires

...t-ocr-google-hires.language-detection-page-results-lowres

...t-ocr-google-lowres.language-detection-page-results-hires

...-ocr-google-lowres.language-detection-page-results-lowres

output-ocr3+4.language-detection-page-results-hires

output-ocr3+4.language-detection-page-results-lowres

output-ocr3.language-detection-page-results-hires

output-ocr3.language-detection-page-results-lowres

output-ocr4.language-detection-page-results-hires

output-ocr4.language-detection-page-results-lowres

requirements.txt

scripts/common.py

scripts/evaluate_accuracy.py

scripts/evaluate_language_detection_page.py