Auto translate will not work for the new translation language

[vickyokrm]

Description:

The Auto translate will not work for new translation language and it always get the previous translation language from the cache which leads to inconsistency in translation

Steps to reproduce:

1. Create a channel and activate auto translation to the desired language.
2. Ask someone to write a message on another language.
3. The translated message will be now displayed, if the issue Recompute message cache for auto translation. #15762 is fixed.
4. Now change the translation language to something different than previously selected.
5. Repeat step 2.
6. The message will not be translated.

Expected behavior:

Auto translate should work even for the new translation language.

Actual behavior:

Translation not working for the new translation language.