Merge pull request #2322 from ssushma/release-6.6.3.a1

Spell checker implemented for resource search.
[UI] [Error fields] All fields that need orange messages should have orange outline : Fixed in Add Url, Collection Title Empty.
Merge pull request #2323 from anilgooru/release-6.6.3.a1

[UI] [Error fields] All fields that need orange messages should have ora...
Added comments.
DO-6074 : [My Collections] When user adds a Youtube Video, we should default to resource format: Video : Implemented.
Merge remote-tracking branch 'upstream/release-6.6.3.a1' into release-6.6.3.a1

* upstream/release-6.6.3.a1:
Merge pull request #2324 from anilgooru/release-6.6.3.a1

DO-6074 : [My Collections] When user adds a Youtube Video, we should default to resource format: Video : Implemented.
Filters enabled on search page after checkbox selection for category and grades