Add keycloak support for multple instances from openid_connect 3.x

The functionality mentioned in the proposed resolution is implemented in the linked issue fork

I noticed the same problem when I tried a Keykloak implementation. The MR looks good so far in a quick review.

Would it be possible for one of the maintainers to review this issue and see if this can be accepted?

Didn't test it out yet. Quickly went through the code and added a few remarks

Thank you for the feedback.

I have provided a updatedb hook for the schema change and fixed the issue with settings.keycloak_i18n_mapping that should be settings.keycloak_i18n.mapping.

I left the initial config as it was since I belive that to be a reasonable default value.

If a maintainer have the chance to look at this I will try to be quick in my response time to move this patch forward towards acceptance.

Here diff from the MR 32 for those who won't have a list from commits in composer.json

Also, thanks @auth for his contribution it works like a charm for me.