fix property mismatch between _language and language

[mchangrh]

Description

Fixed property mismatch between self._language and self.language

Issues Fixed or Closed

• Fixes #5

Type of Change

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas

Explanation

TMDb specifies that language defaults to en-US but that is incorrect, it defaults to None/null.

This is reflected correctly in the raw API https://github.com/meisnate12/TMDbAPIs/blob/7f790278b62da0b92da93832f59c01831c82d7a1/tmdbapis/api3.py#L2192-L2195

but not in the object API https://github.com/meisnate12/TMDbAPIs/blob/7f790278b62da0b92da93832f59c01831c82d7a1/tmdbapis/tmdb.py#L61-L84

self._language is correctly set to initialize to None, which makes it able to pull from all languages, but the property queried for the locale to be passed through is self.language, which is incorrectly set to initialize to "en" None is an invalid language, making it impossible to query for backdrops without languages, or query by all languages as seen in #5

also the language getter/setter targeted _language which was never queried, instead of language

[mchangrh]

MCVE to demonstrate the differences between APIs.

from tmdbapis import TMDbAPIs, api3

apikey = ""
tvid = 202102

objapi = TMDbAPIs(apikey)
obj_show = objapi.tv_show(tvid)

rawapi = api3.API3(apikey)
raw_show = rawapi.tv_get_images(tvid)

def path_only(backdrop):
    return backdrop['file_path'], backdrop['iso_639_1']

print("obj backdrops")
print(obj_show.backdrops)
print("raw backdrops")
print(list(map(path_only, raw_show['backdrops'])))

obj backdrops
[[Backdrop:/1LeXSX1Z7PsWmb4x6SRB61c4dfk.jpg], [Backdrop:/gewfanBcat8DC8hG9rZ64bYI6W2.jpg], [Backdrop:/sj1UGxYusH3oPxNkR0JuJj1eHed.jpg], [Backdrop:/urfRutUKyn4hywQvYS7k0SEzfnT.jpg], [Backdrop:/2wiqHO9l9qoCr9ERDwA1LULsQxd.jpg]]
raw backdrops
[('/aAwtr0pj9jt3DnhTNltOoaOrnk1.jpg', None), ('/1LeXSX1Z7PsWmb4x6SRB61c4dfk.jpg', 'en'), ('/gewfanBcat8DC8hG9rZ64bYI6W2.jpg', 'en'), ('/3R38NDSDituhQDxy24SYG1Q7j9c.jpg', None), ('/sj1UGxYusH3oPxNkR0JuJj1eHed.jpg', 'en'), ('/urfRutUKyn4hywQvYS7k0SEzfnT.jpg', 'en'), ('/2wiqHO9l9qoCr9ERDwA1LULsQxd.jpg', 'en'), ('/c0hBEOLW0CJFELk72BtUdaa3kV2.jpg', None), ('/pz4NEoIn8RHtHqGOXGLejy7hoRt.jpg', None)]

[mchangrh]

Converting to issue as the PR does not properly address the problem