pyocr does not support multiple languages. simple fix
Created by: amitm02
when trying set language to multiple languages, e.g. "heb+eng", there is an exception.
"image_to_string" function at libtesseract/init.py should be modified to something like:
for lang_item in clang.split('+'):
if lang_item not in tesseract_raw.get_available_languages(handle):
raise TesseractError(
"no lang",
"language {} is not available".format(lang_item)
)