Django-text-translator

add [summarize](https://github.com/rss-translator/django-text-translator/commit/275a76899936a2348c1f671b27a73f00e1009b45)
[Allow user defined model fields](https://github.com/rss-translator/django-text-translator/commit/93aa25d9cf39e229b2276086cc249780ecd0d0c4)

[fix error:GoogleTranslateWebTranslator->'NoneType' object is not subscriptable:](https://github.com/rss-translator/django-text-translator/commit/49092646a60d8cb43ef64855dd09bbf86f5862b8)

[use single instead t endpoint](https://github.com/rss-translator/django-text-translator/commit/183ee1d356be7cb64af6a15f2e7b34d941bac8e6)

[update openai validate function](https://github.com/rss-translator/django-text-translator/commit/1ed02cd627b5bca275dbac7903e8bbe01fb109dd)

- add gemini-1.5-pro

update validate functions