Errors in views in local translator

First approach solving all those issues listed, still needs more manual testing to see if there something more that we should fix.

Assigned where already right.

All the errors from the discussed list are fixed except one (Also fixed the thing of the previous comment):

1. manage-translate/assigned lists unassigned closed task, remove
2. formatted text didn't appear in LocalTaskItemForm
3. caching error, invalidate tags in job when update jobitem and invalidate tags in task when update taskitem

Still need to fix button don't change when validating taskitem.

I created followups for the form related issues #2654062: Formattable data item do not show up in LocalTaskItemForm and #2654068: Item confirm buttons does not update properly with ajax.

So I reverted those changes here.

Reverted the remove of the footer and opened a followup #2654198: Incoherence between title and content in manage unassigned translation tasks

When we have a cart it first creates the JobItem, and then when we know the target language it creates a job.
So during this time we have a JobItem without a Job and the tests fail.
Fixed it.

Yes, should be enough to delete the cache clear that are in the test, I'll work on that.

Resetting the cache make the test fail, so It's not enough.

I removed unneeded resetCache in the test but the test doesn't fail without the fix however it fails outside the tests.
Some of them I can't remove as I have to load the objects, and also because the cache is not invalidated between job item and task item, not sure but I think we don't need to change this.
I removed the Save after reviewing as was not needed, does nothing as we don't change anything, the confirm button must save it.
But I found there a small error, when formatted it was not correctly saved, so I fixed it.

We already check it in the line 491:

$this->drupalPostForm(NULL, $edit, t('Save'));
    $this->assertText('The translation for ' . $second_task_item->label() . ' has been saved.');
    // The first item is still completed, the second still untranslated.
    $this->assertRaw('icons/73b355/check.svg" title="Completed"');
    $this->assertRaw('tmgmt/icons/ready.svg" title="Untranslated"');

Rebased and adding a test_only that tests just the cache.