Some valid lang_result with capitalized parts will be incorrectly fallback to the lang_en #41
Description
Some valid lang_results that have capitalized parts present:
lang_zh-CN=Chinese (Simplified)
lang_zh-TW=Chinese (Traditional)
Codes in __init__.py L147 and L169-L175 will cause these lang_result to be incorrectly fallback to the lang_en:
...
self.lang_result = lang_result.lower()
...
# Argument checks.
if self.lang_result not in result_languages_list:
ROOT_LOGGER.error(
f"{self.lang_result} is not a valid language result. See {result_languages_file} for the list of valid "
'languages. Setting lang_result to "lang_en".'
)
self.lang_result = "lang_en"
...