#161670047 Fix error messages

[KMaina]

What does this PR do?

Change error key from msg to success

Description of Task to be completed?

Have more descriptive error codes

How should this be manually tested?

• Clone the repo locally
• Create virtual environment and run pytest
• In Postman supply invalid values and have the key of those error messages being error

Any background context you want to provide?

None

What are the relevant pivotal tracker stories?

#161670047

[coveralls]

Pull Request Test Coverage Report for Build 137

• 5 of 8 (62.5%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 89.495%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
app/api/v2/resource/views/views_products.py	0	3	0.0%

Totals
Change from base Build 133:	0.0%
Covered Lines:	1099
Relevant Lines:	1228

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💛 - Coveralls