Fixes streams field.choice form dropdown value - Issue #2729

This was depending on entry_id but it was null =(
removed redundant isset
Adding alternator to list of allowed functions
Just a little spelling mistake
This comes in very very handy
Updated spanish translations, translated remain items
Updated module spanish translations
Merge pull request #2743 from paquitodev/2.2/develop

Updated spanish translations, translated remain items
Merge pull request #2739 from adamwathan/2.2/develop

Just a little spelling mistake
Merge pull request #2737 from chrisnharvey/patch-1

Adding alternator to list of allowed functions
Treat 0 or '0' as nonempty values
Merge pull request #2730 from ryun/patch-5

Fixes streams field.choice form dropdown value - Issue #2729
Allow get_straem_fields to prefix the field slugs.

This is needed for grid to bypass something really hacky it was doing
when creating the input grid.
Hindi Translation: Core
Update filters partial for Blog admin
Some things like created / updated don't have this
Merge pull request #2795 from avr/2.2/develop

Update filters partial for Blog admin
Faster loading of images
Merge pull request #2816 from churavka/2.2/develop

Faster loading of images
Fixing Overzealous Caching

We should not cache the entire page output, we need to allow caching on
a case by case basis.