Fix race condition in rendering the toolbar in multilingual sites after saving a page

[pnicolli]

This happens very rarely but we saw it happen in production. The PATCH to the server goes through and the saving happens, then the user is rerouted to the view, the content reducer is reset and if the rendering happens at that time, before the GET response comes, the view breaks.

Also, in this PR is a minor fix for the content reducer that currently loses locking info when the GET_CONTENT_SUCCESS action comes.

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[sneridagh]

I tried to fix that also, but it turns out the lock mechanism is broken (see tests). Maybe we should revisit it and rethink it again.

[erral]

We have faced this too.

[pnicolli]

I tried to fix that also, but it turns out the lock mechanism is broken (see tests). Maybe we should revisit it and rethink it again.

@sneridagh Yes it could probably benefit from a rework, but I believe that a very small fix like this could be released in the meantime. This is still breaking multilingual sites from time to time, when I forget to backport this customization to new clients.

I am now running tests again to see if something is missing in order to be mergeable.

[pnicolli]

Closing because fixed in #4377